#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}


template<typename T>
vector<T> make_v(size_t a){return vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

template<typename T,typename U,typename... V>
typename enable_if<is_same<T, U>::value!=0>::type
fill_v(U &u,const V... v){u=U(v...);}

template<typename T,typename U,typename... V>
typename enable_if<is_same<T, U>::value==0>::type
fill_v(U &u,const V... v){
  for(auto &e:u) fill_v<T>(e,v...);
}


//INSERT ABOVE HERE
signed main(){
  Int n,v,sy,sx,gy,gx;
  cin>>n>>v>>sx>>sy>>gx>>gy;
  sy--;sx--;gy--;gx--;

  auto l=make_v<Int>(n,n);
  for(Int i=0;i<n;i++)
    for(Int j=0;j<n;j++)
      cin>>l[i][j];

  auto dp=make_v<Int>(n,n);
  fill_v<Int>(dp,0);
  dp[sy][sx]=v;
  
  for(Int t=0;t<=n*n;t++){
    if(dp[gy][gx]>0){
      cout<<t<<endl;
      return 0;
    }
    
    auto nx=make_v<Int>(n,n);
    fill_v<Int>(nx,0);

    Int dy[]={0,0,1,-1};
    Int dx[]={1,-1,0,0};
    auto in=[&](Int y,Int x){return 0<=y&&y<n&&0<=x&&x<n;};
    
    for(Int i=0;i<n;i++){
      for(Int j=0;j<n;j++){
        for(Int k=0;k<4;k++){
          Int ni=i+dy[k],nj=j+dx[k];
          if(in(ni,nj)) chmax(nx[ni][nj],dp[i][j]-l[ni][nj]);
        }
      }      
    }
    
    swap(dp,nx);
  }
  cout<<-1<<endl;
  return 0;
}