from sys import stdin, stdout
input = lambda: stdin.readline().rstrip()
write = stdout.write

def main():
    N = int(input())

    tnum = set()
    for i in range(1, N + 1):
        n = i * (i + 1) // 2
        tnum.add(n)
        if n >= N:
            break

    if N in tnum:
        ans = 1
    else:
        for i in tnum:
            n = N - i
            if n in tnum:
                ans = 2
                break
        else:
            ans = 3

    print(ans)

main()