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

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