#include <bits/stdc++.h>

using namespace std;

int board[101][101];
int n, v, sx, sy, gx, gy;
int visited[101][101][10001];
int dy[4] = { -1,0,1,0 };
int dx[4] = { 0,1,0,-1 };
int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	cin >> n >> v >> sx >> sy >> gx >> gy;

	for (int i = 1; i <= n; i++)
	{
		for (int j = 1; j <= n; j++)
		{
			cin >> board[i][j];
		}
	}

	memset(visited, -1, sizeof(visited));

	visited[sy][sx][0] = 0;

	queue <pair<pair<int, int>, int>> que;

	que.push(make_pair(make_pair(sy, sx), 0));

	while (!que.empty())
	{
		int y = que.front().first.first;
		int x = que.front().first.second;
		int l = que.front().second;
		que.pop();


		//cout << y << ' ' << x << ' ' << l << ' ' << visited[y][x][l] << '\n';

		if (x == gx && y == gy)
		{
			cout << visited[y][x][l] << '\n';
			return 0;
		}

		for (int k = 0; k < 4; k++)
		{
			int ny = y + dy[k];
			int nx = x + dx[k];
			if (ny <= 0 || ny > n || nx <= 0 || nx > n) continue;
			if (l + board[ny][nx] < v)
			{
				if (visited[ny][nx][l + board[ny][nx]] == -1)
				{
					visited[ny][nx][l + board[ny][nx]] = visited[y][x][l] + 1;
					que.push(make_pair(make_pair(ny, nx), l + board[ny][nx]));
				}
			}
		}
	}

	cout << -1 << '\n';
	return 0;
}