SumSeconds - Chapter 3.0

//Task 007, Chapter 3.0
using System;

public class SumSeconds
{
    static void Main()
    {
        int firstCompetitor = int.Parse(Console.ReadLine());
        int secondCompetitor = int.Parse(Console.ReadLine());
        int thirdCompetitor = int.Parse(Console.ReadLine());

        int seconds = firstCompetitor + secondCompetitor + thirdCompetitor;
        int minutes = 0;

        if(seconds > 59)
        {
            minutes++;
            seconds -= 60;
        }
        if (seconds > 59)
        {
            minutes++;
            seconds -= 60;
        }
        if(seconds < 10)
        {
            Console.WriteLine(minutes + ":" + "0" + seconds);
        }
        else
        {
            Console.WriteLine(minutes + ":" + seconds);
        }
    }
}