Not getting the expected output.

Question

I expected the output to be 2 but I'm getting a 3 instead.

static int Find(int n)
{
int z = n - 1;
int[] a = new int[4];
for(int i = 0; i < 4; i++)
{
a[i] = i + 2;
}
return a[z];
}

static void Main(string[] args)
{
Console.WriteLine(Find(2));
}
}
}

Answer 1

It's supposed to be 3.

Find (2)
=> So z = 2-1 = 1

Since a[i] = i+2,
inside the loop a[1] becomes 1+2 = 3