#include <bits/stdc++.h>

using namespace std;


int main() {
    string N;
    cin >> N;

    if (N[0] == '7' || N[1] == '7' || N[2] == '7') {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }

    return 0;
}