#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define REPR(i, n) for(int i = (int)(n); i >= 0; i--)
#define FOR(i, s, n) for (int i = (s); i < (int)(n); i++)
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;

ll N, K, W, H, M, C, V;

const int MAX = 510000;
const int MOD = 1000000007;

long long fac[MAX], finv[MAX], inv[MAX];

vector<double> cx, cy, c;
 ll MM = 1e12;

void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < MAX; i++){
        fac[i] = fac[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
        finv[i] = finv[i - 1] * inv[i] % MOD;
    }
}

long long COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

std::vector<int> Eratosthenes(int n ){
    std::vector<bool> is_prime( n + 1 );
    for( int i = 0; i <= n; i++ ) is_prime[ i ] = true;
    std::vector<int> P;
    for( int i = 2; i <= n; i++ ){
        if( is_prime[ i ] ){
            for( int j = 2 * i; j <= n; j += i ){
                is_prime[ j ] = false;
            }
            P.emplace_back( i );
        }
    }
    return P;
}

vector<pair<int, int>> edge(tuple<int, int, ll> u){
    vector<pair<int, int>> ret;
    int i = get<0>(u), j = get<1>(u);
    if(i > 0) {ret.push_back(make_pair(i-1, j));}
    if(j > 0) {ret.push_back(make_pair(i, j-1));}
    if(i < N-1) {ret.push_back(make_pair(i + 1, j));}
    if(j < N-1) {ret.push_back(make_pair(i , j + 1));}
    return ret;
}

int main(){
    cin >> N >> V;

    int initx, inity, finx, finy;
    cin >> inity >> initx >> finy >> finx;
    --initx; --inity; --finx; --finy;

    vector<vector<int>> dam(N, vector<int> (N));
    REP(i,N) REP(j,N) cin >>dam[i][j];
    //bfs
    queue<tuple<int, int, ll>> q;
    q.push(make_tuple(initx, inity, V));
    ll dp[N][N][V+1];
    dp[initx][inity][V] =0; 
    while(!q.empty()){
        auto v = q.front();
        q.pop();
        for(auto u : edge(v)){
            ll nv = get<2>(v) - dam[u.first][u.second];
            if(nv <= 0) continue;
            if(dp[u.first][u.second][nv] >= 0) continue;
            dp[u.first][u.second][nv] = dp[get<0>(v)][get<1>(v)][get<2>(v)] + 1 ;         
            if(u.first == finx and u.second == finy) {
                cout <<  dp[u.first][u.second][nv] << "\n";
                return 0;
            }
            q.push(make_tuple( u.first, u.second, nv ));
        }        
    }
    cout << -1 << "\n";
    return 0;
}