#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  n = n % 10;
  cout << n;
  return 0;
  if (n == 2 || n == 4 || n == 5 || n == 7 || n == 9) {
    cout << "hon";
  } else if (n == 3) {
    cout << "bon";
  } else {
    cout << "pon";
  }
}
