#include <bits/stdc++.h>
using namespace std;

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