N = int(input())
F = [1, 1, 1]
for i in range(3, 3000):
    F.append(F[-1] + F[-2])

from math import gcd    
ans = []
for i in range(3000):
    if F[i] % N == 0:
        ans.append(i)
    
g = ans[0]
for i in range(1, len(ans)):
    g = gcd(g, ans[i])
    
print(g)