#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;
using ll = long long;
using p = pair<int, int>;

int main() {
  string N;
  cin >> N;
  int len = N.size();
  bool can = false;
  for (int i =0; i < len; i++) {
    if (N.at(i) == '7') {
      can = true;
      break;
    }
  }
  if (can)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
