# n = int(input())
# dp = [0] + [1 if i**0.5 % 1 == 0 else 0 for i in range(1,n+1)]
# for i in range(2,n+1):
#     if dp[i] :
#         continue
#     k = 1
#     while k*k <= i :
#         if not dp[i] :
#             dp[i] = dp[i-k*k] + 1
#         else :
#             dp[i] = min(dp[i], dp[i-k*k] + 1)
#         k += 1
# print(dp[n])

n = int(input())
if n**0.5%1 == 0 :
    print(1)
else :
    k = 1
    flag = False
    while k*k <= n :
        if (n - k*k)**0.5%1 == 0 :
            print(2)
            flag = True
            break
        k += 1

    if not flag :
        while not n%4 :
            n //= 4
        print(4 if n%8==7 else 3)