#include<stdio.h>
#include<iostream>
#include<string>
using namespace std;

int main(){
    string str;
    while(cin>>str){
        int len = str.length();
        bool flag = true;
        for(int i = 0; i<len; i++){
            if(str[i] == '.' && str[i+1] != '0'){
                flag = false;
            }
        }
        if(flag){
            cout<<"Yes"<<endl;
        }else{
            cout<<"No"<<endl;
        }
    }
}