Second Sum - C# Basics

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {
            int firstTime = int.Parse(Console.ReadLine());
            int secondTime = int.Parse(Console.ReadLine());
            int thurdTime = int.Parse(Console.ReadLine());
            int sum = firstTime + secondTime + thurdTime;
            int minutes = sum / 60;
            int seconds = sum % 60;

            Console.WriteLine("{0}:{1:00}", minutes, seconds);

        }
    }
}