#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); i++)
#define rep2(i,n) for (int i = 1; i <= (n); i++)
using namespace std;
using ll = long long;
using p = pair<int, int>;

int main() {
  string n;
  cin >> n;
  
  bool flag = false;

  rep(i, 3) {
    if (n[i] == '7') flag = true;
  }

  if (flag) cout << "Yes" << endl;
  else cout << "No" << endl;
  
  return 0;
}
