#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: panyuchen
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/