#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void*wmem;
char memarr[96000000];
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;
}
struct Rand{
  unsigned x;
  unsigned y;
  unsigned z;
  unsigned w;
  Rand(void){
    x=123456789;
    y=362436069;
    z=521288629;
    w=(unsigned)time(NULL);
  }
  Rand(unsigned seed){
    x=123456789;
    y=362436069;
    z=521288629;
    w=seed;
  }
  inline unsigned get(void){
    unsigned t;
    t = (x^(x<<11));
    x=y;
    y=z;
    z=w;
    w = (w^(w>>19))^(t^(t>>8));
    return w;
  }
  inline double getUni(void){
    return get()/4294967296.0;
  }
  inline int get(int a){
    return (int)(a*getUni());
  }
  inline int get(int a, int b){
    return a+(int)((b-a+1)*getUni());
  }
  inline long long get(long long a){
    return(long long)(a*getUni());
  }
  inline long long get(long long a, long long b){
    return a+(long long)((b-a+1)*getUni());
  }
  inline double get(double a, double b){
    return a+(b-a)*getUni();
  }
  inline int getExp(int a){
    return(int)(exp(getUni()*log(a+1.0))-1.0);
  }
  inline int getExp(int a, int b){
    return a+(int)(exp(getUni()*log((b-a+1)+1.0))-1.0);
  }
}
;
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 int rd_int(void){
  int x;
  rd(x);
  return 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');
  }
}
struct unionFind{
  int*d;
  int N;
  int M;
  inline void malloc(const int n){
    d = (int*)std::malloc(n*sizeof(int));
    M = n;
  }
  inline void malloc(const int n, const int fg){
    d = (int*)std::malloc(n*sizeof(int));
    M = n;
    if(fg){
      init(n);
    }
  }
  inline void free(void){
    std::free(d);
  }
  inline void walloc(const int n, void **mem=&wmem){
    walloc1d(&d, n, mem);
    M = n;
  }
  inline void walloc(const int n, const int fg, void **mem=&wmem){
    walloc1d(&d, n, mem);
    M = n;
    if(fg){
      init(n);
    }
  }
  inline void init(const int n){
    int i;
    N = n;
    for(i=(0);i<(n);i++){
      d[i] = -1;
    }
  }
  inline void init(void){
    init(M);
  }
  inline int get(int a){
    int t = a;
    int k;
    while(d[t]>=0){
      t=d[t];
    }
    while(d[a]>=0){
      k=d[a];
      d[a]=t;
      a=k;
    }
    return a;
  }
  inline int connect(int a, int b){
    if(d[a]>=0){
      a=get(a);
    }
    if(d[b]>=0){
      b=get(b);
    }
    if(a==b){
      return 0;
    }
    if(d[a] < d[b]){
      d[a] += d[b];
      d[b] = a;
    }
    else{
      d[b] += d[a];
      d[a] = b;
    }
    return 1;
  }
  inline int operator()(int a){
    return get(a);
  }
  inline int operator()(int a, int b){
    return connect(a,b);
  }
  inline int& operator[](const int a){
    return d[a];
  }
  inline int size(int a){
    a = get(a);
    return -d[a];
  }
  inline int sizeList(int res[]){
    int i;
    int sz=0;
    for(i=(0);i<(N);i++){
      if(d[i]<0){
        res[sz++] = -d[i];
      }
    }
    return sz;
  }
}
;
unsigned long long HashMap_ullP_L[4];
template<class KEY, class VAL> struct HashMap{
  char*used;
  KEY*key;
  VAL*val;
  int mem;
  int n;
  int mask;
  HashMap(){
    mem = 0;
  }
  ~HashMap(){
    free();
  }
  void expand(int nn){
    if(mem >= nn){
      return;
    }
    if(mem){
      free();
    }
    mem = nn;
    used = new char[nn];
    key = new KEY[nn];
    val = new VAL[nn];
  }
  void free(){
    if(mem){
      mem = 0;
      delete[] used;
      delete[] key;
      delete[] val;
    }
  }
  void init(int nn){
    int i;
    n = 1;
    nn = nn + (nn + 1) / 2;
    while(n < nn){
      n *= 2;
    }
    mask = n - 1;
    expand(n);
    for(i=(0);i<(n);i++){
      used[i] = 0;
    }
  }
  inline int getHash(const int a){
    unsigned long long d = a;
    d = (((d * HashMap_ullP_L[0]) >> 32) * HashMap_ullP_L[1]) & mask;
    return d;
  }
  inline int getHash(const unsigned a){
    unsigned long long d = a;
    d = (((d * HashMap_ullP_L[0]) >> 32) * HashMap_ullP_L[1]) & mask;
    return d;
  }
  inline int getHash(const long long a){
    unsigned long long d = a;
    d = (((((d * HashMap_ullP_L[0]) >> 32) * HashMap_ullP_L[1]) >> 32) * HashMap_ullP_L[2]) & mask;
    return d;
  }
  inline int getHash(const unsigned long long a){
    unsigned long long d = a;
    d = (((((d * HashMap_ullP_L[0]) >> 32) * HashMap_ullP_L[1]) >> 32) * HashMap_ullP_L[2]) & mask;
    return d;
  }
  inline int getHash(const pair<int,int> a){
    unsigned long long d = (((unsigned long long)a.first) << 32) + ((unsigned long long)a.second);
    d = (((((d * HashMap_ullP_L[0]) >> 32) * HashMap_ullP_L[1]) >> 32) * HashMap_ullP_L[2]) & mask;
    return d;
  }
  inline VAL& operator[](const KEY a){
    int k = getHash(a);
    for(;;){
      if(used[k]==1 && key[k]==a){
        break;
      }
      if(used[k]==0){
        used[k] = 1;
        key[k] = a;
        break;
      }
      k = (k+1) & mask;
    }
    return val[k];
  }
  inline bool exist(const KEY a){
    int k = getHash(a);
    for(;;){
      if(used[k]==1 && key[k]==a){
        return true;
      }
      if(used[k]==0){
        break;
      }
      k = (k+1) & mask;
    }
    return false;
  }
  template<class S> inline bool exist(const KEY a, S &res){
    int k = getHash(a);
    for(;;){
      if(used[k]==1 && key[k]==a){
        res = val[k];
        return true;
      }
      if(used[k]==0){
        break;
      }
      k = (k+1) & mask;
    }
    return false;
  }
}
;
int N;
int D;
int W;
int A;
int B;
int main(){
  int Lj4PdHRW, e98WHCEY;
  wmem = memarr;
  {
    int i;
    int j;
    int k;
    Rand rnd;
    for(i=(0);i<(20);i++){
      rnd.get(2);
    }
    for(i=(0);i<(4);i++){
      for(j=(0);j<(32);j++){
        k = rnd.get(1,62);
        HashMap_ullP_L[i] |= (1ULL << k);
      }
      HashMap_ullP_L[i] |= (1ULL << 0);
      HashMap_ullP_L[i] |= (1ULL << 63);
    }
  }
  int i;
  int x;
  int y;
  long long res = 0;
  unionFind uf1;
  unionFind uf2;
  HashMap<pair<int,int>,int> hs;
  rd(N);
  rd(D);
  rd(W);
  uf1.walloc(N,1);
  uf2.walloc(N,1);
  for(Lj4PdHRW=(0);Lj4PdHRW<(D);Lj4PdHRW++){
    uf1(rd_int()-1, rd_int()-1);
  }
  for(e98WHCEY=(0);e98WHCEY<(W);e98WHCEY++){
    uf2(rd_int()-1, rd_int()-1);
  }
  hs.init(N);
  for(i=(0);i<(N);i++){
    x = uf1(i);
    y = uf2(i);
    if(hs.exist(make_pair(x,y))){
      continue;
    }
    res += (long long)uf1.size(x) * uf2.size(y);
    hs[make_pair(x,y)] = 1;
  }
  wt_L(res - N);
  wt_L('\n');
  return 0;
}
// cLay version 20201120-1 [beta]

// --- original code ---
// int N, D, W, A, B;
// {
//   int i, x, y;
//   ll res = 0;
//   unionFind uf1, uf2;
//   HashMap<pair<int,int>,int> hs;
//   rd(N,D,W);
//   uf1.walloc(N,1);
//   uf2.walloc(N,1);
//   rep(D) uf1(rd_int()-1, rd_int()-1);
//   rep(W) uf2(rd_int()-1, rd_int()-1);
//   hs.init(N);
//   rep(i,N){
//     x = uf1(i);
//     y = uf2(i);
//     if(hs.exist(make_pair(x,y))) continue;
//     res += (ll)uf1.size(x) * uf2.size(y);
//     hs[make_pair(x,y)] = 1;
//   }
//   wt(res - N);
// }