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

int main() {
    string s;
    cin >> s;
    if(s[0] == '7' || s[1] == '7' || s[2] == '7') {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }
    
    return 0;
}