#include <stdio.h>

int main(){

	int N;

	scanf("%d",&N);

	int i;

	int cookie = 1;
	int cnt = 0;

	while (1){
		if (cookie == N){ break; }
		for (i = cookie; i >= 1; i--){
			if (cookie + i <= N){ break; }
		}
		cnt++;
		cookie += i;
	}
	printf("%d\n",cnt);

	return 0;
}