require 'matrix'
def fib(n)
	(Matrix[[1,1],[1,0]]**n)[1,0]
end

n=gets.to_i
if n==2
	p 3
	puts :INF
else
	r=fib(n)
	r-=fib(n/2)**2 if n%2==0
	p n
	p r
end