# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')

def fibo(x):
    if x==1 or x==2:
        return 1
    else:
        return fibo(x-1) + fibo(x-2)

n = int(input())
l=[1,1]
for _ in range(400):
    l.append(l[-1]+l[-2])

for i,v in enumerate(l):
    if v%n == 0:
        print(i+1)
        exit()