#include <stdio.h>

int main () {
  int t = 0;
  
  int res = 0;
  
  res = scanf("%d", &t);
  
  while (t > 0) {
    long long n = 0LL;
    res = scanf("%lld", &n);
    if (n <= 0LL) {
      printf("2\n");
    } else {
      int ans = 0;
      int n10 = (int)(n%10LL);
      for (int i = 0; i < 5; i++) {
        int tmp = 1;
        for (int j = 0; j < i; j++) {
          tmp *= n10+10-j;
          tmp %= 10;
        }
        ans += tmp;
      }
      printf("%d\n", ans%10);
    }
    t--;
  }
  
  return 0;
}