#include<bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    if (n % 10 == 7 || n % 100 / 10 == 7 || n / 100 == 7) {
        cout << "Yes" << endl;
    }
    else {
        cout << "No" << endl;
    }
    return 0;
}