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

typedef long long   signed int LL;
typedef long long unsigned int LU;

#define incID(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define incII(i, l, r) for(int i = (l)    ; i <= (r); i++)
#define decID(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define decII(i, l, r) for(int i = (r)    ; i >= (l); i--)
#define  inc(i, n) incID(i, 0, n)
#define inc1(i, n) incII(i, 1, n)
#define  dec(i, n) decID(i, 0, n)
#define dec1(i, n) decII(i, 1, n)

#define inII(v, l, r) ((l) <= (v) && (v) <= (r))
#define inID(v, l, r) ((l) <= (v) && (v) <  (r))

#define PB push_back
#define EB emplace_back
#define MP make_pair
#define FI first
#define SE second
#define UB upper_bound
#define LB lower_bound
#define PQ priority_queue

#define  ALL(v)  v.begin(),  v.end()
#define RALL(v) v.rbegin(), v.rend()
#define  FOR(it, v) for(auto it =  v.begin(); it !=  v.end(); ++it)
#define RFOR(it, v) for(auto it = v.rbegin(); it != v.rend(); ++it)

template<typename T> bool   setmin(T & a, T b) { if(b <  a) { a = b; return true; } else { return false; } }
template<typename T> bool   setmax(T & a, T b) { if(b >  a) { a = b; return true; } else { return false; } }
template<typename T> bool setmineq(T & a, T b) { if(b <= a) { a = b; return true; } else { return false; } }
template<typename T> bool setmaxeq(T & a, T b) { if(b >= a) { a = b; return true; } else { return false; } }
template<typename T> T gcd(T a, T b) { return (b == 0 ? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }

// ---- ----

int n, v, sx, sy, gx, gy, l[100][100], d[100][100][2000], INF = 10000;

int calc() {
	if(v >= 2000) { return abs(sx - gx) + abs(sy - gy); }
	
	inc(x, n) {
	inc(y, n) {
	inc(w, v + 1) {
		d[x][y][w] = INF;
	}
	}
	}
	
	queue<array<int, 4>> q;
	int dx[4] = { 1, 0, -1,  0 };
	int dy[4] = { 0, 1,  0, -1 };
	
	d[sx][sy][v] = 0;
	q.push({ sx, sy, v, 0 });
	while(! q.empty()) {
		auto e = q.front(); q.pop();
		if(d[e[0]][e[1]][e[2]] != e[3]) { continue; }
		inc(k, 4) {
			int xx = e[0] + dx[k];
			int yy = e[1] + dy[k];
			if(! (inID(xx, 0, n) && inID(yy, 0, n))) { continue; }
			int vv = e[2] - l[xx][yy];
			int ss = e[3] + 1;
			if(vv <= 0) { continue; }
			if(setmin(d[xx][yy][vv], ss)) {
				if(xx == gx && yy == gy) { return ss; }
				q.push({ xx, yy, vv, ss });
			}
		}
	}
	
	return -1;
}

int main() {
	cin >> n >> v >> sx >> sy >> gx >> gy;
	sx--; sy--; gx--; gy--;
	inc(y, n) {
	inc(x, n) {
		cin >> l[x][y];
	}
	}
	
	cout << calc() << endl;
	
	return 0;
}