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

int main() {
  int n;
  cin >> n;
  while (n) {
    if (n % 10 == 7) {
      cout << "Yes" << endl;
      return 0;
    }
    n /= 10;
  }
  cout << "No" << endl;
  return 0;
}