#include <iostream>
#include <vector>
#include <queue>
#include <tuple>

template <class T>
std::vector<T> vec(int len, T elem) { return std::vector<T>(len, elem); }

const std::vector<std::pair<int, int>>
    dxys{{0, 1}, {0, -1}, {1, 0}, {-1, 0}};

void solve() {
    int n, m, sx, sy, gx, gy;
    std::cin >> n >> m >> sy >> sx >> gy >> gx;
    --sx, --sy, --gx, --gy;

    auto xss = vec(n, vec(n, 0));
    for (auto& xs : xss) {
        for (auto& x : xs) std::cin >> x;
    }

    auto dp = vec(m, vec(n, vec(n, -1)));
    dp[m - 1][sx][sy] = 0;

    std::queue<std::tuple<int, int, int>> que;
    que.emplace(m - 1, sx, sy);

    while (!que.empty()) {
        auto [d, x, y] = que.front();
        que.pop();

        for (auto [dx, dy] : dxys) {
            int nx = x + dx,
                ny = y + dy;
            if (nx < 0 || n <= nx ||
                ny < 0 || n <= ny) continue;

            int nd = d - xss[nx][ny];
            if (nd < 0 || dp[nd][nx][ny] != -1) continue;
            dp[nd][nx][ny] = dp[d][x][y] + 1;
            que.emplace(nd, nx, ny);
        }
    }

    int ans = -1;
    for (int d = 0; d < m; ++d) {
        if (dp[d][gx][gy] == -1) continue;
        if (ans == -1 || dp[d][gx][gy] < ans) ans = dp[d][gx][gy];
    }

    std::cout << ans << "\n";
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}