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- using System;
- class OddNumber
- {
- static void Main()
- {
- int numbers = int.Parse(Console.ReadLine());
- int j = 0;
- long[] values = new long[numbers];
- int[] count = new int[numbers];
- for (int i = 0; i < numbers; i++)
- {
- values[i] = long.Parse(Console.ReadLine());
- for (int k = 0; k <= i; k++)
- {
- if (values[i] == values[k])
- {
- count[i]++;
- count[k]++;
- }
- }
- }
- for (j = 0; j < numbers; j++)
- {
- if (count[j] % 2 == 0)
- {
- Console.WriteLine(values[j]);
- break;
- }
- }
- }
- }
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