#include <iostream>
#include <vector>
#include <algorithm>
#include <climits>
#include <string>
#include <unordered_map>
using namespace std;


int main() {

    string N;
    cin >> N;

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


    return 0;
}
