CrossingSequences

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

class Program
{
    static void Main(string[] args)
    {
        int firstTribonacci = int.Parse(Console.ReadLine());
        int secondTribonacci = int.Parse(Console.ReadLine());
        int thirdTribonacci = int.Parse(Console.ReadLine());
        int spiralNumber = int.Parse(Console.ReadLine());
        int step = int.Parse(Console.ReadLine());

        int stepValue = step;

        bool exist = false;

        List<int> tribonacciSequence = new List<int>();
        tribonacciSequence.Add(firstTribonacci);
        tribonacciSequence.Add(secondTribonacci);
        tribonacciSequence.Add(thirdTribonacci);
        int i = 3;
        do
        {

            tribonacciSequence.Add(firstTribonacci + secondTribonacci + thirdTribonacci);
            firstTribonacci = secondTribonacci;
            secondTribonacci = thirdTribonacci;
            thirdTribonacci = tribonacciSequence[i];
            //Console.Write(tribonacciSequence[i] + " ");
            i++;
        }
        while (firstTribonacci + secondTribonacci + thirdTribonacci < 1000000);

        int j = 0;
        do
        {
            if (j % 2 == 0 && j != 0)
            {
                step += stepValue;
            }
            if (spiralNumber > 1000000)
            {
                break;
            }

            if (tribonacciSequence.IndexOf(spiralNumber) != -1)
            {
                exist = true;
            }
            spiralNumber += step;
            j++;
        } while (!exist);

        if(exist)
            Console.WriteLine(spiralNumber - step);
        else
        {
            Console.WriteLine("No");
        }

    }
}