using System;

public class Test
{
	public static void Main()
	{
		int[] roulette = {0, 21, 29, 0, 0, 50};
		int closest = -1;
		int number = 54;
		for (int j = 0; j < roulette.Length; j++)
		   // if the values isn't 0 and it's smaller
		   // and we haven't found a smaller one yet, or this one's closer
		   if (roulette[j] != 0 && roulette[j] < number &&
		       (closest == -1 || roulette[j] > roulette[closest]))
		   {
		      closest = j;
		   }
		
		if (closest == -1) // no smaller number found
		   Console.WriteLine(0);
		else
		   Console.WriteLine(roulette[closest]);
	}
}