#include <stdio.h>
#include <stdlib.h>
int main(int a, char **A)
{
  FILE *B;
  typedef unsigned long C;
  C b[8];
  if (!(a == 7 && (B = fopen(1[A], "rb"))))
    return 1;
  for (7[b] = 0; 7[b] < 5; 7[b]++)
    b[7[b]] = strtoul(A[2+7[b]], 0, 16-!7[b] *6);
  5[b] = 3[b];
  while ((6[b] = getc(B)) != (C) - 1)
  {
    if (2[b])
      for (7[b] = 0; 7[b] < 4; 7[b]++)
        if (((6[b] >> 7[b]) ^ (6[b] >> (7-7[b]))) &1)
          6[b] ^= (1 << 7[b]) ^ (1 << (7-7[b]));
    5[b] ^= 6[b] << (0[b] - 8);
    for (7[b] = 0; 7[b] < 8; 7[b]++)
      if ((5[b] >> (0[b] - 1)) &1)
        5[b] = (5[b] << 1) ^ 1[b];
      else
        5[b] <<= 1;
  }
  5[b] &= ((((C)1 << (0[b] - 1)) - 1) << 1) | 1;
  if (2[b])
    for (7[b] = 0; 7[b] < (0[b] >> 1); 7[b]++)
      if (((5[b] >> 7[b]) ^ (5[b] >> (0[b] - 1-7[b]))) &1)
        5[b] ^= ((C)1 << 7[b]) ^ ((C)1 << (0[b] - 1-7[b]));
  5[b] ^= 4[b];
  fclose(B);
  printf("%0*lX\n", (int)(0[b] + 3) >> 2, 5[b]);
  return 0;
}