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19 lines
310 B
C#
19 lines
310 B
C#
using System;
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namespace _478A
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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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int sum = 0;
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for (int i = 0; i < 5; i++)
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{
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sum += a[i];
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}
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Console.WriteLine((sum % 5 == 0 && sum != 0) ? sum / 5 : -1);
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}
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}
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}
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