L=input() def fib(L): if L<3: return 1 v1=v2=a=b=c=1 d=0 L-=2 while L: if L%2: v2,v1=a*v2+b*v1,c*v2+d*v1 L /= 2 a,b,c,d=a*a+b*b,a*b+b*d,c*a+d*b,c*b+d*d return v2 if L==2: print 3 print "INF" else: ret = fib(L) if L%2==0: ret -= fib(L/2)**2 print L print ret