#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define REP(i, n) for (ll i = 0; i < n; i++)
#define INF 9223372036854775807
#define all(x) (x).begin(), (x).end()

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  string n;
  cin >> n;

  cout << (n[1] == '7' || n[2] == '7' || n[3] == '7' ? "Yes" : "No");
}