Jagged Array In C#

using System;
class JaggedTest {
    static void Main(string[] args) {
        int[][] jarr = new int[3][];
        int s = 0;
        for (int i = 0; i < 3; i++) {
            Console.WriteLine("Enter the Size of the Array" + (i + 1));
            int n = Convert.ToInt16(Console.ReadLine());
            jarr[i] = new int[n];
            Console.WriteLine("Enter the Values of Array " + (i + 1));
            for (int j = 0; j < n; j++) {
                jarr[i][j] = Convert.ToInt16(Console.ReadLine());
                s = s + jarr[i][j];
            }
            n = n + 0;
        }
        Console.WriteLine("Sum= " + s);
        Console.ReadKey();
    }
}