#include<stdio.h>

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

int main(void) {
	int N;
	int tri[10000];
	int tri1, tri2;
	int l = 0;
	int k = 0;
	int m = 0;

	scanf("%d", &N);

	tri[0] = 0;
	for (int j = 1; tri[j-1] < 10000000; j++) {
		tri[j] = sankaku(j);
	}

	//１つか２つの三角数のどちらであるかを判定
	do{
		k++;
		tri1 = tri[k];
		if (N == tri1) {
			printf("1\n");
			return 1;
        }
    }while (N > tri1);

    do{
        l++;
        m = l-1;
        do{
            m++;
            tri2 = tri[l] + tri[m];
            if (N == tri2) {
                printf("2\n");
                return 2;
            }
        } while (N > tri2);
    }while(N > tri[l]);

	printf("3\n");

	return 0;

}