from math import gcd

n = int(input())


li = [0,1,1,2]

for i in range(800):
    li.append(li[-2] + li[-1])

v = -1
for i in range(1, len(li)):
    if li[i] % n == 0:
        if v == -1:
            v = i
        else:
            v = gcd(v, i)

print(v)