#include <bits/stdc++.h>
using namespace std;
 
int main() {
    int N;
    string n;
    cin >> N;
 
    n = to_string(N);

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


  	return 0;
}