Preparando MOJI
For a positive integer n let's define a function f:
f(n) = - 1 + 2 - 3 + .. + ( - 1)nn
Your task is to calculate f(n) for a given integer n.
The single line contains the positive integer n (1 ≤ n ≤ 1015).
Print f(n) in a single line.
4
2
5
-3
f(4) = - 1 + 2 - 3 + 4 = 2
f(5) = - 1 + 2 - 3 + 4 - 5 = - 3
Informação
Provedor Codeforces
Código CF486A
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Submetido 0
BOUA! 0
Taxa de BOUA's 0%
Datas 09/05/2023 08:54:34
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