N = int(input())
if N == 1:
    print(1)
elif N == 2:
    print(3)
else:
    F = [0] * (101010)
    F[1] = F[2] = 1
    for n in range(3, 100000):
        F[n] = (F[n - 1] + F[n - 2]) % N
        if F[n] == 0:
            exit(print(n))