输出保留3位小数的浮点数
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Description
读入一个单精度浮点数，保留3位小数输出这个浮点数。
Format
Input
只有一行，一个单精度浮点数。
Output
也只有一行，读入的单精度浮点数。
Samples
12.34521
12.345
Limitation
1s, 64KiB for each test case.