#include <stdio.h>

int set_pocket(int *pocket, int n);
int get_pocket(int *pocket, int n);
int strike_pocket(int *pocket);

int count = 0;

int main(int argc, char *argv[]) {
  int N; // N
  int pocket = 0; // num of bistcuit in pocket
  int hand = 0; // num of bistcuit in hand
  int gap; // residual quantity(N - pocket)
  scanf("%d", &N);
  set_pocket(&pocket, 1);
  while(1) {
    if (N != 1) strike_pocket(&pocket);
    if (pocket == N) {
      break;
    } else if (pocket*2 > N) {
      gap = N - pocket;
      hand = get_pocket(&pocket, pocket - gap);
      strike_pocket(&pocket);
      break;
    }
  }
  printf("%d", count);
  return 0;
}
int set_pocket(int *pocket, int n) {
  return (*pocket) = n;
}
int get_pocket(int *pocket, int n) {
  int ret = (*pocket);
  (*pocket) -= n;
  return n;
}
int strike_pocket(int *pocket) {
  count++;
  return (*pocket) *= 2;
}