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

int main() {
    vector<char> S(3);


    cin >> S.at(0)>> S.at(1) >> S.at(2);
    
    if(S.at(0)=='7'||S.at(1)=='7'||S.at(2)=='7'){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }





}