#include<stdio.h>

int main(void) {
	int N;
	int num = 1;
	int nummax = 1;
	int sum;
	int count=0;
	scanf("%d", &N);
	while (N >= num * 2) {
		num *= 2;
		nummax = num;
		count++;
	}
	sum = num;
	while (N - sum > 0) {
		while (N - (sum + num) >= 0) {
			sum += num;
			count++;
		}
		while (N - sum < num / 2) {
			num /= 2;
		}
		while (N - (sum + num) < 0) {
			num--;
		}
	}

	printf("%d", count);

}