12
 1378
 51202278
 989898989
 4
 7
 9
 6
 8
 12193721
 999999995
 999999999
 11
 999999996
 999999998
 3
 14
 15
 10
 999999994
 1000
 13781378
 5
 999999997
 1000000000
 13
 16
 0

6
 4
 4
 8
 6
 2
 8
 4
 6
 8
 2
 2
 2
 6
 4
 2
 4
 2
 4
 4
 6
 4
 8
 8
 6
 8
 6
 1

#include <bits/stdc++.h>
int main() {
  int n;
  while (~scanf("%d", &n) && n >= 0) {
    long long m = 1, a = 1378 % 10;
    while (n) {
      if (n % 2 == 1) m = (m % 10) * a;
      a = (a % 10) * a;
      n /= 2;
    }
    printf("%lld\n", m % 10);
  }
}
