#include <bits/stdc++.h>
using namespace std;

int main( )
{
    int n;
    cin >> n;
    if (n % 10 == 7) {
        cout << "Yes\n";
        return 0;
    }
    n /= 10;
    if (n % 10 == 7) {
        cout << "Yes\n";
        return 0;
    }
    n /= 10;
    if (n % 10 == 7) {
        cout << "Yes\n";
        return 0;
    }
    n /= 10;
    cout << "No\n";
    return 0;
}
