#include <stdio.h>
#include <bits/stdc++.h>

using namespace std;

int main(){
    int N;
    cin >> N;
    int a,b,c;
    a = N/100;
    b = N%100/10;
    c = N%100%10;
    if(a==7 || b==7 || c==7){
        cout << "Yes" << endl;
    }
  else{
        cout << "No" << endl;
    }
}
