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/*

Have the function SimpleAdding(num) add up all the numbers from 1 to num. For example: if the input is

4 then your program should return 10 because 1 + 2 + 3 + 4 = 10. For the test cases, the parameter num will

be any number from 1 to 1000.

*/

using System;

public class Solution0005

{

public static int SimpleAdding(int number)

{

int result = 0;

int sum = (number * (number + 1)) / 2;

result = sum;

return result;

}

static void Main()

{

Console.WriteLine(SimpleAdding(Console.ReadLine()));

}

}