#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;
  if (n[0] == '7' || n[1] == '7' || n[2] == '7') cout << "Yes" << endl;
  else cout << "No" << endl;

  return 0;
}
