n = int(input())

C = []
i = 1
while i * (i + 1) // 2 <= n:
    C.append(i * (i + 1) // 2)
    i += 1

if C[-1] == n:
    print(1)
    exit()
m = len(C)
for i in range(m):
    for j in range(i, m):
        if C[i] + C[j] == n:
            print(2)
            exit()
print(3)