#include <iostream>
#include <queue>
#include <tuple>
using namespace std;

constexpr int8_t DX[4] = {0, 1, 0, -1}, DY[4] = {1, 0, -1, 0};
int8_t N, sx, sy, gx, gy, L[100][100];
int16_t V, d[100][100];

int main(void) {
	ios::sync_with_stdio(false);
	
	scanf("%hhd %hd %hhd %hhd %hhd %hhd", &N, &V, &sx, &sy, &gx, &gy);
	--sx, --sy, --gx, --gy;
	
	for(int8_t i = 0; i < N; ++i) for(int8_t j = 0; j < N; ++j) scanf("%hhd", &L[i][j]);
	
	queue<tuple<int16_t, int8_t, int8_t, int16_t>> que;
	d[sx][sy] = V;
	que.push(make_tuple(0, sx, sy, V));
	
	while(!que.empty()) {
		auto [dist, x, y, c] = que.front();
		que.pop();
		
		if(x == gx and y == gy) {
			printf("%d", dist);
			return 0;
		}
		
		for(int8_t dir = 0; dir < 4; ++dir) {
			int8_t nx = x + DX[dir], ny = y + DY[dir];
			if(!(0 <= nx and nx < N and 0 <= ny and ny < N)) continue;
			int16_t nc = c - L[ny][nx];
			if(d[nx][ny] < nc) {
				d[nx][ny] = nc;
				que.push(make_tuple(dist + 1, nx, ny, nc));
			}
		}
	}
	
	printf("-1\n");
	return 0;
}