#include <iostream>
#include <vector>
#include <string>
using namespace std;

int main(){
    string s; cin >> s;

    s += "0";
    int bitcnt = 0;
    int blockcnt = 0;
    bool f = false;
    for(auto &it: s){
        if(it == '1') bitcnt++;
        if(f != (it == '1')){
            if(f) blockcnt++;
            f = !f;
        }
    }
    if(bitcnt == 0 || bitcnt == 2 || (blockcnt == 1 && bitcnt > 1)) cout << "Yes" << endl;
    else cout << "No" << endl;
    return 0;
}