What will be the output of the following C# code?

static void Main(string[] args)
{
    int i;
    int j = 1;
    int []ar = {21, 22, 13, 4};
    switch (ar[j])
    {
    case 1:
        i++;
        break;
    case 2:
        i += 2;
        j = 3;
        continue;
    case 3: 
       i %= 2;
       j = 4;
       continue;
    default: 
       --i;
    }
    Console.WriteLine(i);
    Console.ReadLine();
}