Masala H

Xotira 16 MB Vaqt 1000 ms
14

Mergan

Merganning nishonga tekkizish ehtimolligi aa ga teng. Mergan nn marta o’q otganda n1n-1 marta nishonga tegish ehtimolligini toping.


Kiruvchi ma'lumotlar:

Haqiqiy son a(0a1)a(0≤a≤1) va nn natural son (1n 105)(1 ≤ n ≤ 10^5)


Chiquvchi ma'lumotlar:

Nishonga tegish ehtimolligi 10410^{-4} aniqlikda chiqaring.


Misollar
# input.txt output.txt
1
0.9 4
0.2916
2
0 7
0.0000