#include <stdio.h>

int main(void)
{
  int num, count = 0, biscuit = 1;

  scanf("%d", &num);
  while(num != biscuit){
    biscuit *= 2;
    if(biscuit  > num){
      biscuit /= 2;
      biscuit += (num - biscuit ) * 2 - (num - biscuit);
    }
    count++;
  }
  printf("%d\n", count);

  return 0;
}