ZJiaQ want to become a strong man, so he decided to play the mook jong”£ZJiaQ want to put some mook jongs in his backyard. His backyard consist of n bricks that is 1*1,so it is 1*n”£ZJiaQ want to put a mook jong in a brick. because of the hands of the mook jong£¬ the distance of two mook jongs should be equal or more than 2 bricks. Now ZJiaQ want to know how many ways can ZJiaQ put mook jongs legally(at least one mook jong).
Input
There ar multiply cases. For each case, there is a single integer n( 1 < = n < = 60)
