#include "LastDigit.cpp"

int main(int argc, char **argv)
{
  int i;
  class LastDigit TheClass;
  long long retval;
  long long S;

  if (argc != 2) { fprintf(stderr, "usage: a.out num\n"); exit(1); }

/*
  S = ;
*/


  if (atoi(argv[1]) == 0) {
    S = 564;
  }

  if (atoi(argv[1]) == 1) {
    S = 565;
  }

  if (atoi(argv[1]) == 2) {
    S = 3000;
  }

  if (atoi(argv[1]) == 3) {
    S = 137174210616796;
  }

  if (atoi(argv[1]) == 4) {
    S = 837592744927492746;
  }

  if (atoi(argv[1]) == 5) {
    S = 999999999999999999;
  }

  if (atoi(argv[1]) == 6) {
    S = 1001;
  }

  retval = TheClass.findX(S);
  cout << retval << endl;

  exit(0);
}