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

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