how to do this nested loop

Question

a nested loop such that the inner loop is exected n times and the outer loop in executed m times.

Within the inner loop add 2 to the value of the varaible sum.

 

using System;

namespace HelloWorld
{
class Program
{
static void Main(string[] args)
{
int n = 4; int m = 3;
int sum = 0;



Console.WriteLine(sum);
}
}
}