#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <array>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

const i64 INF = 1001001001001001001;

using modint = atcoder::static_modint<998244353>;

int main(){
    int H,W; cin >> H >> W;
    vector<vector<i64>> A(H, vector<i64>(W));
    rep(y,H) rep(x,W) cin >> A[y][x];
    vector<vector<i64>> dp0(H, vector<i64>(W, -INF));
    vector<vector<i64>> dp1(H, vector<i64>(W, -INF));
    dp0[0][0] = dp1[0][0] = A[0][0];
    rep(y,H) rep(x,W){
        if(y != 0){
            dp1[y][x] = max(dp1[y][x], dp0[y-1][x]);
            if(A[y][x] <= dp0[y-1][x]) dp0[y][x] = max(dp0[y][x], dp0[y-1][x] + A[y][x]);
            if(A[y][x] <= dp1[y-1][x]) dp1[y][x] = max(dp1[y][x], dp1[y-1][x] + A[y][x]);
        }
        if(x != 0){
            dp1[y][x] = max(dp1[y][x], dp0[y][x-1]);
            if(A[y][x] <= dp0[y][x-1]) dp0[y][x] = max(dp0[y][x], dp0[y][x-1] + A[y][x]);
            if(A[y][x] <= dp1[y][x-1]) dp1[y][x] = max(dp1[y][x], dp1[y][x-1] + A[y][x]);
        }
    }

    bool ans = dp1[H-1][W-1] > 0;
    cout << (ans ? "Yes\n" : "No\n");
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;