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

int main(int argc, char *argv[]) {
  int n, i;
  char bin[100];

  if (argc < 2) return 1;

  n = atoi(argv[1]);

  for (i=0; n != 0; i++, (n = n/2))
    bin[i] = (n%2) ? '1' : '0';

  /* print reversed bin[] */
  for (; i >= 0; i--) printf("%c", (i>0) ? bin[i-1] : '\n');

  return 0;
}