#include <iostream>
using namespace std;

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