#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
typedef long long ll;
 
int main() {
  String n; cin >> n;
  if (n.find("7")) cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}