小明是个小学五年级的学生，为了早点去看自己爱看的卡通，他想快点把作业做完。可是可恶的数学老师今天却布置了一道难题，小明想了很久也不知道该怎么做。你的任务就是帮小明解决掉这道数学题。

题目是这样子的，有一个整数a（-2^31<= a < 2^31-1），计算它的整数幂a^n，其中1<=n<=99。-Xiao Ming is a fifth-grade students, in order to see his early love to watch cartoons, he wanted the job done quickly. But the nasty math teacher has arranged a problem today, Xiao Ming like a long time do not know how to do. Your task is to help Xiao Ming out this math problem solving.

Topic is like this, there is an integer a (-2 ^ 31 <= a <2 ^ 31-1), calculate its integral power a ^ n, where 1 <= n <= 99.