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

int main() {
  string N;
  int count = 0;
  cin >> N;
  
  for (int i = 0; i < 3; i++) {
    
    if (N.at(i) == 7) {
      count++;
    }
    
    else {
      continue;
    }
    
  }
  
  if (count == 0){
    cout << "No" << endl;
  }
  
  else {
    cout << "Yes" << endl;
  }
  
  
}
