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

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