#include<stdio.h>

int main(void) {
	int N;
	int count = 0;

	scanf("%d", &N);

	while (N != 1) {
		if (N % 2 == 0) {
			N = N / 2;
			count++;
		}

		else {
			N++;
			count++;
		}
	}
	
	printf("%d\n", count);

	return 0;

}