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

int main(void)
{
  int N;
  cin >> N;
  if (N / 100 == 7)
  {
    cout << "Yes" << endl;
  }
  else if ((N / 10) % 10 == 7)
  {
    cout << "Yes" << endl;
  }
  else if (N % 10 == 7)
  {
    cout << "Yes" << endl;
  }
  else
  {
    cout << "No" << endl;
  }
  return 0;
}