实数高精度运算，考察基本功。需要注意的是输入数据可能不包含小数点或者小数点出现在最后一位数字的后面（即输出结果为整数）的情况，更需要注意的是截除结尾的若干零和在小数点之后添加若干零的情况。

测试数据 #0: Accepted, time = 0 ms, mem = 556 KiB, score = 10
测试数据 #1: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #2: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #3: Accepted, time = 0 ms, mem = 556 KiB, score = 10
测试数据 #4: Accepted, time = 15 ms, mem = 564 KiB, score = 10
测试数据 #5: Accepted, time = 0 ms, mem = 564 KiB, score = 10
测试数据 #6: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #7: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #8: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #9: Accepted, time = 0 ms, mem = 556 KiB, score = 10
Accepted, time = 15 ms, mem = 564 KiB, score = 100
http://www.cnblogs.com/Coolxxx/p/5348104.html

Easy pie!