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sakapon/B.cs

Created December 14, 2019 11:06
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sumitrust2019 B - Tax Rate (2)
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B.cs
using System;
class B
{
static void Main()
{
var n = int.Parse(Console.ReadLine());
var x = Math.Ceiling(n / 1.08);
Console.WriteLine((int)(1.08 * x) == n ? $"{x}" : ":(");
}
}
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