N = int(input())
K = []
for k in range(1,N+1):
    if k*(k+1)//2>N:break
    K.append(k*(k+1)//2)
from bisect import bisect_left
ind = bisect_left(K,N)
if ind<len(K) and K[ind]==N:
    print(1)
else:
    flag = 3
    for k in K:
        ind = bisect_left(K,N-k)
        if ind<len(K) and K[ind]==N-k:
            flag = 2
            break
    print(flag)