n=int(input())
san=[]
se=set()
for i in range(1,n+1):
    t=i*(1+i) // 2
    if t > n:
        break
    san.append(t)
    se.add(t)

ans = 4
for i in range(len(san)):
    t1 = san[i]
    if n == t1:
        ans=1
        break
    for j in range(i,len(san)):
        t2 = san[j]
        if t1 + t2 == n:
            ans = min(ans,2)
            break
        t = n - (t1 + t2)
        if t in se:
            ans = min(ans,3)

print(ans)