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