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

int main() {
  int N;
  cin >> N;
  
  if ((n[0]==n[1]==n[2]==7) (n[0]==7) (n[0]==n[1]==7)
      (n[0]==n[2]==7) (n[1]==7) (n[1]==n[2]==7)
      (n[2]==7){
    cout << "Yes" << endl;
  }
  else {
    cout << "No" << endl;
  }
}