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

int main() {
    int N;
    cin >> N;
    int a, b, c;
    a = N / 100;
    b = (N % 100) / 10;
    c = (N % 10);
    if (a == 7 || b == 7 || c == 7) {
        cout << "Yes" << endl;
    }
    else {
        cout << "No" << endl;
    }
}