public class EvenOdd {


	public static void main(String[] args) {



		System.out.println(isEven(21));


	}

		public static boolean isEven(int n){

						if (n==0) return true;
						else return isOdd(n-1);

	}

		public static boolean isOdd(int n){

						if(n==0) return false;
						else return isEven(n-1);
		}

}