#include<bits/stdc++.h>
using namespace std;
#define int long long

int dx[]{1,0,-1,0},dy[]{0,1,0,-1};
int board[100][100];
int dp[100][100][2001]; //{y,x,HP} = 移動回数

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(false);

  int N,V,Sx,Sy,Gx,Gy; cin >> N >> V >> Sx >> Sy >> Gx >> Gy;
  Sx--,Sy--,Gx--,Gy--;
  for(int i = 0; i < N; i++){
    for(int j = 0; j < N; j++){
      cin >> board[i][j];
    }
  }

  V = min(V,2000LL);
  for(int i = 0; i < N; i++){
    for(int j = 0; j < N; j++){
      fill(dp[i][j],dp[i][j]+V+1,-1);
    }
  }
  dp[Sy][Sx][V] = 0;
  queue< tuple<int,int,int> > q;
  q.push({Sy,Sx,V});
  while(!q.empty()){
    auto p = q.front(); q.pop();
    int y = get<0>(p);
    int x = get<1>(p);
    int v = get<2>(p);
    for(int i = 0; i < 4; i++){
      int ny = y + dy[i];
      int nx = x + dx[i];
      if(ny < 0 || N <= ny || nx < 0 || N <= nx) continue;
      int nv = v - board[ny][nx];
      if(nv <= 0) continue;
      if(dp[ny][nx][nv] != -1) continue;
      dp[ny][nx][nv] = dp[y][x][v] + 1;
      if(ny == Gy && nx == Gx){
        cout << dp[ny][nx][nv] << endl;
        return 0;
      }
      q.push({ny,nx,nv});
    }
  }
  cout << -1 << endl;

  return 0;
}