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WAP to find sum of 'n' natural numbers

 using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace natural_sum
{
Class Program
{
static void main(string[] args)
{
int n, i, sum= 0;
Console.WriteLine("How many numbers.");
n = Convert.ToInt32(Console.ReadLine());
for (i= 1; i<= n; i++)
{
sum = sum +1;
}
Console.WriteLine("The sum of n natural numbers is : {0}", sum);
Console.ReadLine();
}
}
}

Output:
How many numbers.
4
The sum of n natural number is: 10







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