计算a+aa+aaa+…之和－循环[易]

Time Limit
1s
Memory Limit
131072KB
Judge Program
Standard
Ratio(Solve/Submit)
63.80%(795/1246)
Description:

输入两个正整数a和n，输出a+aa+aaa+…+a…a（n个a）之和。例如，输入2和3，输出246（2+22+222）。

Input:

2  3

Output:

246

Sample Input:
3  4
Sample Output:
3702
Source:

cxliu

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