#include <iostream>
#include <string>
using namespace std;
int main() {
  string s;
  cin >> s;
  if (s.at(0) == '7' || s.at(1) == '7' || s.at(2) == '7') {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}