import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the no of days");
        int rowsize = sc.nextInt();
        sc.nextLine();
        double [][] sales = new double[rowsize][];
        System.out.println(Arrays.toString(sales));
        double sum =0.0;
        for(int i=0;i<rowsize;i++){
            System.out.println("Enter the no of sales on day "+(i+1));
            int n = sc.nextInt();
            sc.nextLine();
            sales[i]=new double[n];
            System.out.println("enter the amount for day "+(i+1));
            for(int j=0;j<n;j++){
                sales[i][j] = sc.nextDouble();
                sum+=sales[i][j];
            }
        }
        for(int i=0;i<sales.length;i++){
        System.out.println("say :"+(i+1)+" ---> "+Arrays.toString(sales[i]));
        }
        System.out.println("Average sale ----> "+(sum/rowsize));
    }
}