#include <bits/stdc++.h>
using namespace std;
const int INF = 1001001001;

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




return 0;
}
