#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long ll;

int main() {
	ll I;
	cin >> I;
	if (I==45)
	{
		cout << "Yes" << endl;
	}
	else
	{
		cout << "No" << endl;
	}
	return 0;
}