using System;
public class Test
{
public static void Main()
{
int sum = 0, num;
for (int x = 1; x < 100; x++)
{
num = (int)Math.Pow(x, 2) - 81;
if (num % 100 == 0)
{
Console.WriteLine("x: " + x + " value: " + num);
sum += x;
}
}
Console.WriteLine("SUM: " + sum);
}
}
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