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14 lines
235 B
C#
14 lines
235 B
C#
using System;
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namespace _486A
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{
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class Program
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{
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static void Main(string[] args)
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{
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ulong n = ulong.Parse(Console.ReadLine());
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Console.WriteLine(n % 2 == 0 ? (n / 2).ToString() : "-" + ((n + 1) / 2).ToString());
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}
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}
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}
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