#include<stdio.h>

int tri(int k) {
	int num = k * (k + 1) / 2;
	return num;
}

int main(void) {
	int N;
	int tri1,tri2;
	int k = 1;
	int m = 1;

	scanf("%d", &N);

	//１つか２つの三角数のどちらかを判定
	do{
		tri1 = tri(k);
		if (N == tri1) {
			printf("1\n");
			return 1;
		}

		m = k;
		do{
			tri2 = tri(m);
			if (N == tri1 + tri2) {
				printf("2\n");
				return 2;
			}

			m++;

		} while (N > tri1 + tri2);

		k++;
		
	} while (N > tri1);

	printf("3\n");

	return 0;

}