import java.util.Scanner;
public class Lab06_Task02 {
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        boolean w = false;
        boolean q = false;
        int t = s.nextInt();
        if (t<0) {
            System.out.println("Negative number of students not allowed!!");
        } else {
            int i = 0;
            int c = 0;
            int mark[] = new int[99999];
            while(i<t) {
                mark[c] = s.nextInt();
                if(mark[c]<0) {
                    w = true;
                }
                if(mark[c]>100) {
                    q = true;
                }
                c++;
                i++;
            }
            int sum = 0;
            i = 0;
            while(i<c) {
                sum = sum+mark[i];
                i++;
            }
            double avg =(double) sum/c;
            if (w){
                System.out.println("Negative marks not allowed!!");
            } else if(q) {
                System.out.println("Marks above 100 not allowed!!");
            } else {
                System.out.println("Sum = "+sum+" and Average = "+String.format("%.2f",avg));
            }
        }
    }
}