Problem1219--计算：t=1-1/(2*2)-1/(3*3)-...-1/(m*m)

1219: 计算：t=1-1/(2*2)-1/(3*3)-...-1/(m*m)

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Time Limit : 1.000 sec  Memory Limit : 128 MiB

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Description

计算：t=1-1/(2*2)-1/(3*3)-...-1/(m*m)

Input

整型变量m

Output

t(保留六位小数)

Sample Input Copy 

10

Sample Output Copy 

0.450232

Source/Category

admin 
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