#include <bits/stdc++.h>
#define int long long
using namespace std;
const int MOD = 1000000007;
using Graph = vector<vector<int>>;

signed main() {
  string N;
  cin >> N;
  if( N.at(0) == '7' || N.at(1) == '7' || N.at(2) == '7' ) cout << "Yes" << endl;
  else cout << "No" << endl;
}
