#include <iostream>
using namespace std;
int main() {
    int a[15][15]={0},i,j,n,m,b;
    cin>>n>>m;
    for(i=0;i<n;i++){
        for(j=0;j<m;j++){
            cin>>a[i][j]; 
        }
    }
    for(i=0;i<n;i++){
        for(j=0;j<m;j++){
            if(a[i][j]!=0&&a[i][j]!=1){
                cout<<"No"; 
                return 0;
            }
        }
    }
    cout<<"Yes";
    return 0;
}
/**************************************************************
	Problem: 1828
	User: wengsihan
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/