using System;
public class Test
{
public static void Main()
{
Console.WriteLine("Введите число");
int x=Convert.ToInt16(Console.ReadLine());
int y=0;
int z=0;
Console.WriteLine(x);
while(++y<=x)
{
z=y+z;
}
Console.WriteLine("Сумма всех чисел от 1 до {0}={1}",x,z);
}
}
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