题目描述
Given n,k and the function f(n,k) = 1^k + 2^k + ... + n^k , you're supposed to calculate it.
输入格式
<p> Multiple test cases. </p> <p> Each line contains two numbers n,k(1<=n,k<=10^9) </p>
输出格式
Output the last digit of the function f(n,k)
样例
样例输入 1
1 1
8 4
2 5
3 2
5 2
8 3
2 4
样例输出 1
1
2
3
4
5
6
7
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