#include <iostream>
#include <vector>
using namespace std;

int main(){
    string s;
    cin >> s;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] == '7') {
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
    return 0;
}