#include <bits/stdc++.h>
using namespace std;
int main() {
  int num = 0, a = 0, b = 0, c = 0;
  cin >> num;
  a = num / 100;
  b = (num - a * 100) / 10;
  c = num - a * 100 - b * 10;
  if (a == 7 || b == 7 || c == 7)
    cout << "Yes";
  else
    cout << "No";
  return 0;
}
