#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void*wmem;
char memarr[96000000];
template<class S, class T> inline S min_L(S a,T b){
  return a<=b?a:b;
}
template<class S, class T> inline S max_L(S a,T b){
  return a>=b?a:b;
}
template<class T> inline void walloc1d(T **arr, int x, void **mem = &wmem){
  static int skip[16] = {0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
  (*mem) = (void*)( ((char*)(*mem)) + skip[((unsigned long long)(*mem)) & 15] );
  (*arr)=(T*)(*mem);
  (*mem)=((*arr)+x);
}
template<class T> inline void walloc1d(T **arr, int x1, int x2, void **mem = &wmem){
  walloc1d(arr, x2-x1, mem);
  (*arr) -= x1;
}
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
inline void rd(long long &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(long long x){
  int s=0;
  int m=0;
  char f[20];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
template <class T> struct LHeap{
  int*hp;
  int*place;
  int size;
  T*val;
  void malloc(int N){
    hp = (int*)std::malloc(N*sizeof(int));
    place=(int*)std::malloc(N*sizeof(int));
    val=(T*)std::malloc(N*sizeof(T));
  }
  void malloc(int N, int ini){
    hp = (int*)std::malloc(N*sizeof(int));
    place=(int*)std::malloc(N*sizeof(int));
    val=(T*)std::malloc(N*sizeof(T));
    if(ini){
      init(N);
    }
  }
  void walloc(int N, void **mem=&wmem){
    walloc1d(&hp, N, mem);
    walloc1d(&place, N, mem);
    walloc1d(&val, N, mem);
  }
  void walloc(int N, int ini, void **mem=&wmem){
    walloc1d(&hp, N, mem);
    walloc1d(&place, N, mem);
    walloc1d(&val, N, mem);
    if(ini){
      init(N);
    }
  }
  void free(){
    std::free(hp);
    std::free(place);
    std::free(val);
  }
  void init(int N){
    int i;
    size=0;
    for(i=(0);i<(N);i++){
      place[i]=-1;
    }
  }
  void up(int n){
    int m;
    while(n){
      m=(n-1)/2;
      if(val[hp[m]]<=val[hp[n]]){
        break;
      }
      swap(hp[m],hp[n]);
      swap(place[hp[m]],place[hp[n]]);
      n=m;
    }
  }
  void down(int n){
    int m;
    for(;;){
      m=2*n+1;
      if(m>=size){
        break;
      }
      if(m+1<size&&val[hp[m]]>val[hp[m+1]]){
        m++;
      }
      if(val[hp[m]]>=val[hp[n]]){
        break;
      }
      swap(hp[m],hp[n]);
      swap(place[hp[m]],place[hp[n]]);
      n=m;
    }
  }
  void change(int n, T v){
    T f = val[n];
    val[n] = v;
    if(place[n]==-1){
      place[n] = size;
      hp[size++] = n;
      up(place[n]);
    }
    else{
      if(f < v){
        down(place[n]);
      }
      else if(f > v){
        up(place[n]);
      }
    }
  }
  int pop(void){
    int res = hp[0];
    place[res] = -1;
    size--;
    if(size){
      hp[0]=hp[size];
      place[hp[0]]=0;
      down(0);
    }
    return res;
  }
}
;
template<class FT, class CT> struct minCostFlows{
  int node;
  int*es;
  int*emem;
  int**edge;
  int**rev;
  FT**flow;
  FT f_eps;
  CT**cost;
  CT*potential;
  CT c_eps;
  LHeap<CT> hp;
  char*reached;
  CT*cur_cost;
  int*level;
  void malloc(int N){
    int i;
    es = (int*)std::malloc(N*sizeof(int));
    emem = (int*)std::malloc(N*sizeof(int));
    edge = (int**)std::malloc(N*sizeof(int*));
    rev = (int**)std::malloc(N*sizeof(int*));
    flow = (FT**)std::malloc(N*sizeof(FT*));
    cost = (CT**)std::malloc(N*sizeof(CT*));
    for(i=(0);i<(N);i++){
      emem[i] = 0;
      edge[i] = rev[i] = NULL;
      flow[i] = NULL;
      cost[i] = NULL;
    }
    hp.malloc(N);
    reached = (char*)std::malloc(N*sizeof(char));
    cur_cost = (CT*)std::malloc(N*sizeof(CT));
    potential = (CT*)std::malloc(N*sizeof(CT));
    level = (int*)std::malloc(N*sizeof(int));
    node = N;
    for(i=(0);i<(N);i++){
      es[i] = 0;
    }
    f_eps = (FT)1e-9;
    c_eps = (CT)1e-9;
  }
  void init(int N){
    int i;
    node = N;
    for(i=(0);i<(N);i++){
      es[i] = 0;
    }
    f_eps = (FT)1e-9;
    c_eps = (CT)1e-9;
  }
  void memoryExpand(int i, int sz){
    if(sz <= emem[i]){
      return;
    }
    sz =max_L(max_L(sz, 3), 2*emem[i]);
    emem[i] = sz;
    edge[i] = (int*)realloc(edge[i], sz*sizeof(int));
    rev[i] = (int*)realloc(rev[i], sz*sizeof(int));
    flow[i] = (FT*)realloc(flow[i], sz*sizeof(FT));
    cost[i] = (CT*)realloc(cost[i], sz*sizeof(CT));
  }
  void addEdge(int n1, int n2, FT f, CT c){
    int s1 = es[n1]++;
    int s2 = es[n2]++;
    if(s1 >= emem[n1]){
      memoryExpand(n1, es[n1]);
    }
    if(s2 >= emem[n2]){
      memoryExpand(n2, es[n2]);
    }
    edge[n1][s1] = n2;
    edge[n2][s2] = n1;
    rev[n1][s1]  = s2;
    rev[n2][s2]  = s1;
    flow[n1][s1] = f;
    flow[n2][s2] = 0;
    cost[n1][s1] = c;
    cost[n2][s2] = -c;
  }
  FT solve_do_flow(int i, int ed, FT flim){
    int j;
    int k;
    FT res = 0;
    FT tmp;
    FT send;
    CT nc;
    if(i == ed){
      return flim;
    }
    for(j=(0);j<(es[i]);j++){
      if(flow[i][j] <= f_eps){
        continue;
      }
      k = edge[i][j];
      if(reached[k]==0 || level[k] <= level[i]){
        continue;
      }
      nc = cur_cost[i] + cost[i][j] + potential[i] - potential[k];
      if(cur_cost[k] < nc - c_eps || cur_cost[k] > nc + c_eps){
        continue;
      }
      if(flim < -f_eps){
        send = flow[i][j];
      }
      else{
        send =min_L(flim, flow[i][j]);
      }
      tmp = solve_do_flow(k, ed, send);
      if(tmp < f_eps){
        continue;
      }
      res += tmp;
      flow[i][j] -= tmp;
      flow[k][rev[i][j]] += tmp;
      if(flim >= -f_eps){
        flim -= tmp;
        if(flim <= f_eps){
          break;
        }
      }
    }
    return res;
  }
  template<class FTS, class CTS> void solve(int st, int ed, FTS &fres, CTS &cres, FT flim = -1, CT clim = 0){
    int i;
    int j;
    int k;
    int l;
    FT f;
    CT nc;
    fres = 0;
    cres = 0;
    for(i=(0);i<(node);i++){
      potential[i] = 0;
    }
    for(;;){
      if(flim >= -f_eps && flim <= f_eps){
        break;
      }
      hp.init(node);
      for(i=(0);i<(node);i++){
        reached[i] = 0;
      }
      reached[st] = 1;
      cur_cost[st] = 0;
      l = 0;
      hp.change(st, cur_cost[st]);
      while(hp.size){
        i = hp.pop();
        level[i] = l++;
        for(j=(0);j<(es[i]);j++){
          if(flow[i][j] <= f_eps){
            continue;
          }
          k = edge[i][j];
          nc = cur_cost[i] + cost[i][j] + potential[i] - potential[k];
          if(reached[k]==0 || cur_cost[k] > nc+c_eps){
            reached[k] = 1;
            cur_cost[k] = nc;
            hp.change(k, cur_cost[k]);
          }
        }
      }
      if(reached[ed]==0){
        break;
      }
      if(flim==-2 && cur_cost[ed] + potential[ed] >= clim){
        break;
      }
      f = solve_do_flow(st, ed, flim);
      if(f <= f_eps){
        break;
      }
      for(i=(0);i<(node);i++){
        if(reached[i]){
          potential[i] += cur_cost[i];
        }
      }
      fres += f;
      cres += f * potential[ed];
      flim -= f;
    }
  }
}
;
int N;
int M;
int A[100000];
int B[100000];
long long C[100000];
long long D[100000];
int main(){
  int i;
  wmem = memarr;
  int f;
  long long c;
  minCostFlows<int,long long> flow;
  rd(N);
  rd(M);
  {
    int AlM5nNnR;
    for(AlM5nNnR=(0);AlM5nNnR<(M);AlM5nNnR++){
      rd(A[AlM5nNnR]);A[AlM5nNnR] += (-1);
      rd(B[AlM5nNnR]);B[AlM5nNnR] += (-1);
      rd(C[AlM5nNnR]);
      rd(D[AlM5nNnR]);
    }
  }
  flow.malloc(N);
  flow.init(N);
  for(i=(0);i<(M);i++){
    flow.addEdge(A[i], B[i], 1, C[i]);
    flow.addEdge(B[i], A[i], 1, C[i]);
    flow.addEdge(A[i], B[i], 1, D[i]);
    flow.addEdge(B[i], A[i], 1, D[i]);
  }
  flow.solve(0, N-1, f, c, 2);
  wt_L(c);
  wt_L('\n');
  return 0;
}
// cLay version 20201204-1 [beta]

// --- original code ---
// template<class FT, class CT>
// struct minCostFlows {
//   int node;
//   int *es, *emem, **edge, **rev;
//   FT **flow, f_eps;
//   CT **cost, *potential, c_eps;
//   
//   LHeap<CT> hp;
//   char *reached;
//   CT *cur_cost;
//   int *level;
// 
//   void malloc(int N){
//     int i;
//     es = (int*)std::malloc(N*sizeof(int));
//     emem = (int*)std::malloc(N*sizeof(int));
//     edge = (int**)std::malloc(N*sizeof(int*));
//     rev = (int**)std::malloc(N*sizeof(int*));
//     flow = (FT**)std::malloc(N*sizeof(FT*));
//     cost = (CT**)std::malloc(N*sizeof(CT*));
//     rep(i,N){
//       emem[i] = 0;
//       edge[i] = rev[i] = NULL;
//       flow[i] = NULL;
//       cost[i] = NULL;
//     }
//     
//     hp.malloc(N);
//     reached = (char*)std::malloc(N*sizeof(char));
//     cur_cost = (CT*)std::malloc(N*sizeof(CT));
//     potential = (CT*)std::malloc(N*sizeof(CT));
//     level = (int*)std::malloc(N*sizeof(int));
// 
//     node = N;
//     rep(i,N) es[i] = 0;
//     f_eps = (FT)1e-9;
//     c_eps = (CT)1e-9;
//   }
// 
//   void init(int N){
//     int i;
//     node = N;
//     rep(i,N) es[i] = 0;
//     f_eps = (FT)1e-9;
//     c_eps = (CT)1e-9;
//   }
// 
//   void memoryExpand(int i, int sz){
//     if(sz <= emem[i]) return;
//     sz = max(sz, 3, 2emem[i]);
//     emem[i] = sz;
//     edge[i] = (int*)realloc(edge[i], sz*sizeof(int));
//     rev[i] = (int*)realloc(rev[i], sz*sizeof(int));
//     flow[i] = (FT*)realloc(flow[i], sz*sizeof(FT));
//     cost[i] = (CT*)realloc(cost[i], sz*sizeof(CT));
//   }
// 
//   void addEdge(int n1, int n2, FT f, CT c){
//     int s1 = es[n1]++;
//     int s2 = es[n2]++;
//     if(s1 >= emem[n1]) memoryExpand(n1, es[n1]);
//     if(s2 >= emem[n2]) memoryExpand(n2, es[n2]);
//     edge[n1][s1] = n2; edge[n2][s2] = n1;
//     rev[n1][s1]  = s2; rev[n2][s2]  = s1;
//     flow[n1][s1] = f; flow[n2][s2] = 0;
//     cost[n1][s1] = c; cost[n2][s2] = -c;
//   }
// 
//   FT solve_do_flow(int i, int ed, FT flim){
//     int j, k;
//     FT res = 0, tmp, send;
//     CT nc;
// 
//     if(i == ed){
//       return flim;
//     }
//     rep(j,es[i]){
//       if(flow[i][j] <= f_eps) continue;
//       k = edge[i][j];
//       if(reached[k]==0 || level[k] <= level[i]) continue;
//       nc = cur_cost[i] + cost[i][j] + potential[i] - potential[k];
//       if(cur_cost[k] < nc - c_eps || cur_cost[k] > nc + c_eps) continue;
//       
//       if(flim < -f_eps){
//         send = flow[i][j];
//       } else {
//         send = min(flim, flow[i][j]);
//       }
//       tmp = solve_do_flow(k, ed, send);
//       if(tmp < f_eps) continue;
//       
//       res += tmp;
//       flow[i][j] -= tmp;
//       flow[k][rev[i][j]] += tmp;
//       
//       if(flim >= -f_eps){
//         flim -= tmp;
//         if(flim <= f_eps) break;
//       }
//     }
//     
//     return res;
//   }
// 
//   template<class FTS, class CTS>
//   void solve(int st, int ed, FTS &fres, CTS &cres, FT flim = -1, CT clim = 0){
//     int i, j, k, l;
//     FT f;
//     CT nc;
// 
//     fres = 0;
//     cres = 0;
//     rep(i,node) potential[i] = 0;
// 
// 
//     for(;;){
//       if(flim >= -f_eps && flim <= f_eps) break;
//       hp.init(node);
//       rep(i,node) reached[i] = 0;
//       reached[st] = 1;
//       cur_cost[st] = 0;
//       l = 0;
//       hp.change(st, cur_cost[st]);
//       while(hp.size){
//         i = hp.pop();
//         level[i] = l++;
//         rep(j, es[i]){
//           if(flow[i][j] <= f_eps) continue;
//           k = edge[i][j];
//           nc = cur_cost[i] + cost[i][j] + potential[i] - potential[k];
//           if(reached[k]==0 || cur_cost[k] > nc+c_eps){
//             reached[k] = 1;
//             cur_cost[k] = nc;
//             hp.change(k, cur_cost[k]);
//           }
//         }
//       }
//       if(reached[ed]==0) break;
//       if(flim==-2 && cur_cost[ed] + potential[ed] >= clim) break;
//       f = solve_do_flow(st, ed, flim);
//       if(f <= f_eps) break;
// 
//       rep(i,node) if(reached[i]) potential[i] += cur_cost[i];
//       fres += f;
//       cres += f * potential[ed];
//       flim -= f;
//     }
//   }
// };
// 
// 
// int N, M, A[1d5], B[1d5]; ll C[1d5], D[1d5];
// {
//   int f; ll c;
//   minCostFlows<int,ll> flow;
//   rd(N,M,(A--,B--,C,D)(M));
//   flow.malloc(N);
//   flow.init(N);
//   rep(i,M){
//     flow.addEdge(A[i], B[i], 1, C[i]);
//     flow.addEdge(B[i], A[i], 1, C[i]);
//     flow.addEdge(A[i], B[i], 1, D[i]);
//     flow.addEdge(B[i], A[i], 1, D[i]);
//   }
//   flow.solve(0, N-1, f, c, 2);
//   wt(c);
// }