#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  string s;
  cin >> s;
  for (char& c : s) if (c == '7') {
    cout << "Yes" << endl;
    return 0;
  }
  cout << "No" << endl;
  return 0;
}