/*
 * Prints an int in hexadecimal, in the proper order
 *
 */

#include <stdio.h>

void print_hex(int x);

int main(int argc, char *argv[])
{
  int x;
  scanf("%d", &x);
  print_hex(x);
  return 0;
}

void print_hex(int x)
{
  int curr = 1;
  while(curr * 16 < x) curr *= 16; // or curr << 4
  while(x) {
    int r = x / curr;
    if(r > 9) {
      printf("%c", 'a' + (r - 10));
    } else {
      printf("%d", r);
    }
    x %= curr;
    curr /= 16; // or curr >> 4
  }
  printf("\n");
}