#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi  = vector<int>; using vb  = vector<bool>; using vd  = vector<double>; using vl  = vector<ll>;
using vvi = vector<vi>;  using vvb = vector<vb>;   using vvd = vector<vd>;     using vvl = vector<vl>;

#define REP(i,n) for(ll i=0; i<(n); ++i)

int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};

bool contain(ll n, ll x) { return 0 <= x && x < n; }

int main() {
	ll n, v, sx, sy, gx, gy;
	cin >> n >> v >> sx >> sy >> gx >> gy;
	sx--; sy--; gx--; gy--;
	vvi field(n, vi(n));
	REP(y, n) REP(x, n) cin >> field[y][x];

	vvl vital(n, vl(n, 0));
	using P = pair<ll, pair<ll, pair<ll,ll>>>;
	priority_queue<P, vector<P>, greater<P>> que;
	que.push({0, {v, {sx, sy}}});
	while (!que.empty()) {
		auto _ = que.top(); que.pop();
		ll times = _.first;
		ll cur_v = _.second.first;
		auto pos = _.second.second;
		if (pos.first == gx && pos.second == gy) {
			cout << times << endl; return 0;
		}
		
		if (vital[pos.second][pos.first] >= cur_v) continue;
		vital[pos.second][pos.first] = cur_v;

		REP(i, 4) {
			auto n_pos = make_pair(pos.first + dx[i], pos.second + dy[i]);
			if (!contain(n, n_pos.first) || !contain(n, n_pos.second)) continue;
			ll n_v = cur_v - field[n_pos.second][n_pos.first];
			if(n_v > vital[n_pos.second][n_pos.first]) que.push({ times + 1, { n_v, n_pos } });
		}
	}

	cout << -1 << endl;
	return 0;
}