import java.util.Scanner;

public class No3555 {

	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		
		int Y = Integer.parseInt(scanner.next());
		int N = Integer.parseInt(scanner.next());
		
		int i = 0;
		int sum = 0;
		for(i = 0;i < N;i++) {
			
			sum += Integer.parseInt(scanner.next());
			
		}
		
		scanner.close();
		
		if(Y - sum >= 0) {
			
			System.out.println(Y - sum);
			
		}else {
			
			System.out.println("red");
			
		}
		

	}

}