题目描述

Every positive number can be presented by the exponential form.For example, 137 = 2^7 + 2^3 + 2^0。

Let's present a^b by the form a(b).Then 137 is presented by 2(7)+2(3)+2(0). Since 7 = 2^2 + 2 + 2^0 and 3 = 2 + 2^0 , 137 is finally presented by 2(2(2)+2 +2(0))+2(2+2(0))+2(0).

Given a positive number n,your task is to present n with the exponential form which only contains the digits 0 and 2.