import math
import sys
input = sys.stdin.readline
N = int(input())
F = [1%N, 1%N]
F.append((F[-1]+F[-2])%N)
while F[0]!=F[-2] or F[1]!=F[-1]:
    F.append((F[-1]+F[-2])%N)
M = [[] for _ in range(N)]
for i in range(len(F)-2):
    M[F[i]].append(i+1)
ans = 0
for m in M[0]:
    ans = math.gcd(ans, m)
print(ans)