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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    class Program
    {
        static long T = 3;
        static long P = 5;
        static long H = 6;
        static long Tn = 3;
        static long Pn = 7;
        static long Hn = 9;
        static void Main(string[] args)
        {
            int nums = 0;
            while (nums <= 1)
            {
                if (T <= P && T <= H)
                {
                    T += Tn;
                    Tn += 1;
                }
                else if (P <= T && P <= H)
                {
                    P += Pn;
                    Pn += 3;
                }
                else if (H <= T && H <= P)
                {
                    H += Hn;
                    Hn += 4;
                }
                if ((T == P) && (T == H))
                    nums++;
            }
            Console.WriteLine(T);
            Console.ReadKey();
        }
    }
}