#include <bits/stdc++.h>
using namespace std;

#ifdef _RUTHEN
#include "debug.hpp"
#else
#define show(...) true
#endif

using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
template <class T> using V = vector<T>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int H, W;
    cin >> H >> W;
    V<V<ll>> A(H, V<ll>(W));
    rep(i, H) rep(j, W) cin >> A[i][j];
    V<V<V<ll>>> dp(H, V<V<ll>>(W, V<ll>(2, 0)));
    dp[0][0][0] = A[0][0];
    rep(i, H) {
        rep(j, W) {
            if (i + 1 < H) {
                rep(k, 2) {
                    if (dp[i][j][k] > A[i + 1][j]) {
                        dp[i + 1][j][k] = max(dp[i + 1][j][k], dp[i][j][k] + A[i + 1][j]);
                    } else {
                        if (k == 0) {
                            dp[i + 1][j][1] = max(dp[i + 1][j][1], dp[i][j][0]);
                        }
                    }
                }
            }
            if (j + 1 < W) {
                rep(k, 2) {
                    if (dp[i][j][k] > A[i][j + 1]) {
                        dp[i][j + 1][k] = max(dp[i][j + 1][k], dp[i][j][k] + A[i][j + 1]);
                    } else {
                        if (k == 0) {
                            dp[i][j + 1][1] = max(dp[i][j + 1][1], dp[i][j][0]);
                        }
                    }
                }
            }
        }
    }
    cout << (max(dp[H - 1][W - 1][0], dp[H - 1][W - 1][1]) > A[H - 1][W - 1] ? "Yes" : "No") << '\n';
    return 0;
}