#include <stdio.h>
#include <stdlib.h>

void greska(){
  fprintf(stderr, "-1\n");
  exit(EXIT_FAILURE);
}

int main(int argc, char const *argv[]) {
  if(argc != 3){
    greska();
  }
  int i = atoi(argv[1]);
  int j = atoi(argv[2]);

  if( i > j || i < 1 || j < 1 || i > 4 || j > 4){
    greska();
  }

  unsigned x;
  scanf("%d", &x);

  unsigned maska = 0;
  int k = 8;
  while( k > 0){
    maska |= 1;
    maska <<= 1;
    k --;
  }

  unsigned i_bajt = (x & (maska << (i-1)*8)) >> (i-1)*8 ;
  unsigned j_bajt = (x & (maska << (j-1)*8)) >> (j-1)*8;

  x = x & ~(maska << (j-1)*8) & ~(maska << (i-1)*8);

  x |= (i_bajt << (j-1)*8);
  x |= (j_bajt << (i-1)*8);

  printf("%u\n", x);

  return 0;
}