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0014. Tok kuchi

Time limit : 1000 ms
Memory limit : 64 mb

Zanjiring kuchlanishi U va qarshiligi R. Zanjirdan oqib o`tayotgan to`q kuchini toping.


Kiruvchi ma’lumotlar:

ikkita butun son U va R (1U,R100)


Chiquvchi ma’lumotlar:

bitta son masala yechimi 103 aniqlikda.

Input
8 7
Output
1.143
Input
18 12
Output
1.500