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

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

      
    
      
    