1. Look for any missing symbol(s) in the string formatting syntax.

using System;

internal class Program
{
    static void Main(string[] args)
    {

        int num_1 = 10;
        int num_2 = num_1 * 2;
        int num_3 = num_2 * 3;
        int num_4 = num_1 + num_2 + num_3;

        // Change code below this line
        Console.WriteLine($"The sum of {num_1}, {num_2} and {num_3} is {num_4}");
        // Change code above this line
    }
}