#include <iostream>
#include <algorithm>
#include <vector>
#include <deque>
#include <queue>
#include <set>
#include <map>
#include <limits>
#include <cmath>
#include <iomanip>
#include <functional>
#include <random>
#include <unordered_map>
using namespace std;
using ll = long long;

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