// yukicoder: No.642 Two Operations No.1
// 2019.4.14 bal4u

#include <stdio.h>

int main()
{
	int N, ans;
	
	scanf("%d", &N);
	ans = 0;
	while (N > 1) {
		if (N & 1) N++, ans++;
		N >>= 1, ans++;
	}
	printf("%d\n", ans);
	return 0;
}