#include <iostream>
#include <ostream>
#include <stdio.h>
using namespace std;

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