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

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