using System;
using System.Collections.Generic;
using System.Linq;

namespace BasicStackOperations
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] commands = Console.ReadLine()            
                .Split(" ", StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToArray();
        
            int[] numbers = Console.ReadLine()
                .Split(" ", StringSplitOptions.RemoveEmptyEntries)            
                .Select(int.Parse)
                .ToArray();

            Stack<int> stackOfNumbers = new Stack<int>();

            for (int i = 0; i < commands[0]; i++)
            {
                stackOfNumbers.Push(numbers[i]);
            }

            for (int i = 0; i < commands[1]; i++)
            {
                stackOfNumbers.Pop();
            }

            int smallestNumberInStack = int.MaxValue;
            bool printSmallestNumber = false;               
            
            while (stackOfNumbers.Count != 0 && !printSmallestNumber)
            {
                int currentNumber = stackOfNumbers.Pop();

                if (currentNumber == commands[2])
                {
                    printSmallestNumber = true;
                }

                if (currentNumber < smallestNumberInStack)
                {
                    smallestNumberInStack = currentNumber;
                }
            }
    
            if (printSmallestNumber)
            {
                Console.WriteLine("true");
            }
            else
            {
                smallestNumberInStack = smallestNumberInStack == int.MaxValue ? 0 : smallestNumberInStack;

                Console.WriteLine(smallestNumberInStack);
            }
        }
    }
}