C++ :

#include<bits/stdc++.h>
using namespace std;
#define LL long long
#define down cout<<"\n";
#define speed std::ios::sync_with_stdio(false);

const int N=1e5+5;



int main(){
	string s;
	cin>>s;
	bool flag=1;
	for(int i=0;i<s.size();i++){
		if(s[i]!='0' && s[i]!='1'){
			flag=0;
		}
	}
	if(flag){
		cout<<"Yes";
	} else {
		cout<<"No";
	}
	return 0;
}