#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    cin.tie(0);
    ios_base::sync_with_stdio(false);

    int H, W;
    cin >> H >> W;
    vector A(H, vector<ll>(W));
    rep(i, H) rep(j, W) cin >> A[i][j];

    vector dp(H, vector(W, vector<ll>(2)));
    dp[0][0][0] = A[0][0];
    rep(i, H) rep(j, W) {
        if (i + 1 < H) {
            if (dp[i][j][0] > A[i + 1][j])
                dp[i + 1][j][0] = max(dp[i + 1][j][0], dp[i][j][0] + A[i + 1][j]);
            else if (i + 1 != H - 1 && j != W - 1)
                dp[i + 1][j][1] = max(dp[i + 1][j][1], dp[i][j][0]);

            if (dp[i][j][1] > A[i + 1][j])
                dp[i + 1][j][1] = max(dp[i + 1][j][0], dp[i][j][1] + A[i + 1][j]);
        }
        if (j + 1 < W) {
            if (dp[i][j][0] > A[i][j + 1])
                dp[i][j + 1][0] = max(dp[i][j + 1][0], dp[i][j][0] + A[i][j + 1]);
            else if (i != H - 1 && j + 1 != W - 1)
                dp[i][j + 1][1] = max(dp[i][j + 1][1], dp[i][j][0]);

            if (dp[i][j][1] > A[i][j + 1])
                dp[i][j + 1][1] = max(dp[i][j][0], dp[i][j][1] + A[i][j + 1]);
        }
    }

    if (dp[H - 1][W - 1][0] == 0 && dp[H - 1][W - 1][1] == 0)
        cout << "No\n";
    else
        cout << "Yes\n";

    return 0;
}