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14 lines
250 B
C#
14 lines
250 B
C#
using System;
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namespace _546A
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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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int[] a = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
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Console.WriteLine("{0}", Math.Max(a[0] * a[2] * (a[2] + 1) / 2 - a[1], 0));
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}
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}
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}
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