import math

from collections import defaultdict

n = int(input())
k = defaultdict(lambda:-1)
a = []

kuri = -1
offset = -1

i = 1
j = 1
for cnt in range(1010):
	if k[(i, j)] >= 0:
		offset = k[(i, j)]
		kuri = cnt - k[(i, j)]
		break
	a.append((i, j))
	k[(i, j)] = cnt
	i, j = (i+3*j)%1000, (i+j)%1000

#print(a)

#print(offset, kuri)

if n == 0:
	print(1)
elif n-1 < offset:
	if n % 2 == 1:
		print(a[n-1][0]*2%1000)
	else:
		print((a[n-1][0]*2 - 1)%1000)
else:
	targ = (n-1-offset) % kuri
	if n % 2 == 1:
		print(a[targ+offset][0]*2%1000)
	else:
		print((a[targ+offset][0]*2 - 1)%1000)