#include<bits/stdc++.h>
using namespace std;
int main() {
	int a[20][20],m,n;
	bool f=true;
	cin>>n>>m;
	for(int i=0;i<n;i++){
		for(int j=0;j<m;j++){
			cin>>a[i][j];
			if(a[i][j]!=0&&a[i][j]!=1){
				f=false;
			}
		}
	}
	if(f==true){
		cout<<"Yes"<<endl;
	}else{
		cout<<"No"<<endl;
	}
	return 0;
}
/**************************************************************
	Problem: 1828
	User: admin
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/