#include <stdio.h>

#define bsize_of_int sizeof(int) * 8	/* Bitová šířka intu */

int main(void)
{
  int n, b_log, krok;
  krok = b_log = bsize_of_int/2;
  scanf("%d",&n);
  for(;;)
    {
      krok = krok >> 1;
      if (n < (1<<b_log))
	b_log-=krok;
      else if (n >= (1<<(b_log+1)))
	b_log+=krok;
      else break;
    }
  printf("%d\n",b_log);
  return 0;
}