#include <iostream>
#include <bits/stdc++.h>
using namespace std;
using ll = int64_t;
#define rep(i,n) for(int i = 0; i < ((int)(n)); i++)   // 0-indexed昇順

int main() {
    int N;
    cin >> N;
    while (N > 0) {
        int B = N % 10;
        if (B == 7) {
            cout << "Yes" << endl;
            return 0;
        }
        N /= 10;
    }
    cout << "No" << endl;
}
