#include<iostream>
#include<string>
using namespace std;
int main()
{
	string s;
	while (cin >> s) {
		bool flag = true;
		bool dot = false;
		for (int i = 0; i < s.length(); i++) {
			if (s[i] == '.') {
				dot = true;
				continue;
			}
			if (dot && s[i] != '0') {
				flag = false;
				break;
			}
			if (s[i] < '0' || s[i] > '9') {
				flag = false;
				break;
			}
		}
		if (flag)
			cout << "Yes" << endl;
		else
			cout << "No" << endl;
	}
	return 0;
}