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0945. ifoda

Time limit : 1000 ms
Memory limit : 64 mb

Ushbu ifodani hisoblang.

$S = (1+a)(1+a^2)(1+a^4)(1+a^8)...$


Kiruvchi ma’lumotlar:

Bitta haqiqiy son $a(0\le a <1)$


Chiquvchi ma’lumotlar:

$S$ ning qiymatini $10^{-5}$ aniqlikda chiqaring



Input
0
Output
1.00000