#include<bits/stdc++.h>
using namespace std;
int main() {
	int a[10][10]={0},n,m,i,j,h=0;
	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) h++;
		}
	}
	if(h==n*m) cout<<"Yes";
	else cout<<"No"; 
}
/**************************************************************
	Problem: 1828
	User: linzihang
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/