import java.util.Scanner;

public class MoneyWisely{
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		int Y = sc.nextInt();
		int N = sc.nextInt();
		
		sc.nextLine();

		String message = "";
		
		for(int i = 0; i < N; i++){
			Y -= sc.nextInt();
		}
		
		if(Y < 0){
			System.out.println("red");
		}else{
			System.out.println(Y);
		}
	}
}