#include <bits/stdc++.h>
using namespace std;
 
int main() {
    int N;
    cin >> N;
    if(N/100 == 7 || (N/10)%10 == 7 || N%10 == 7){
        cout << "Yes" << endl;
    }
    else{
        cout << "No" << endl;
    }
}