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1075. summa drobei

Time Limit: 1 seconds
Memory Limit:65536KB
Points:1
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дано n.

найти сумму .

Input

число n

Output

число sum

Sample

InputOutput
Пример 1. Вход:
3
Пример 1. Выход:
2.28815

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1043. n-корней 1075. 1072. summa drobej 1073. summa2 988. А(35(б))
We can all benefit by doing occasional "toy" programs, when artificial restrictions are set up, so that we are forced to push our abilities to the limit. The art of tackling miniproblems with all our energy will sharpen our talents for the real problems. Donald E. Knuth.
time generating 0.344 sec.
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