T = [i * (i + 1) // 2 for i in range(4473)]


def find(i, x):
    low = 0
    high = len(x) - 1
    t = (low + high) // 2 
    while (low <= high):
        if (i == x[t]):
            break
        elif (i > x[t]):
            low = t + 1
        elif (i < x[t]):
            high = t - 1
        t = (low + high) // 2
    return t if x[t] == i else -1

N = int(input())
if find(N, T) >= 0:
    print('1')
    exit()
else:
    i = 0
    while N - T[i] > 0:
        if find(N - T[i], T) >= 0:
            print('2')
            exit()
        i += 1
print('3')