import java.util.Scanner;

class Quiz2 {
	public static void main(String[] args) {

		Scanner kb = new Scanner(System.in);

		System.out.println("Enter 4 integers");

		int side1 = kb.nextInt();
		int side2 = kb.nextInt();
		int side3 = kb.nextInt();
		int side4 = kb.nextInt();

		if(side1 <= 0 || side2 <= 0 || side3 <= 0 || side4 <= 0) {
			System.out.println("Invalid input");
			return;
		}
		
		int circumference = side1 + side2 + side3 + side4;

		System.out.println("circumference: " + circumference);
		System.out.printf("circumference: %d\n", circumference);

		if(circumference % 2 == 1) {
			System.out.println("is odd");
		}
		else {
			System.out.println("is even");
		}
	
		

	}
}