import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


n = int(input())
l = [1]
for i in range(2,n+1):
    if l[-1]+i>n:
        break
    l.append(l[-1]+i)
ans = None
if l[-1]==n:
    ans = 1
else:
    for i in range(len(l)):
        for j in range(len(l)):
            if l[i]+l[j]==n:
                ans = 2
if ans is None:
    ans = 3
print(ans)