#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <map>
#include <string>
using namespace std;

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

  return 0;
}
