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0316. Yakuniy_2_G

Time limit : 1000 ms
Memory limit : 64 mb

Yig’indini xisoblang


$$\frac{cos(1)}{1}+\frac{cos(2)}{2}+...+\frac{cos(n)}{n}$$


Kiruvchi ma’lumotlar: Bitta butun son $n$ $(1 \le n \le 100)$


Chiquvchi ma’lumotlar: Bitta son masala yechimi. Bitta son masala yechimi. Yechim $10^{-2}$ aniqlikda chiqarilsin .

Input
1
Output
0.54
Input
19
Output
0.07