#include <stdio.h>

int DecToBin();

int main()
{
  int rc=0;

  rc = DecToBin();

  return rc;
}

int DecToBin() {

  int decimal;  /* number to be input from user */
  int result;   /* result of dividing by power of 2 */

  printf("Please input a number between 0 and 1024 \n");
  scanf("%d",&decimal);

  if (decimal<0 || decimal > 1024) {
    printf("%d is an invalid input. Exiting. \n",decimal);
    return -1;
  }

  result = decimal / 1024;
  if (result == 0) {
    printf("0");
  }
  else {
    printf("1");
    decimal = decimal - 1024;
  }

  printf("\n");
  return 0;
}