write a recursive method that uses only addition subtraction

write a recursive method that uses only addition, subtraction and comparison to multiply two numbers.

Solution

public static int Multiply(int x, int y)
{
return MulTi(x, y, x);
}
public static int MulTi(int x, int y, int result)
{
if (y == 0 || x == 0)
return 0;
if (y == 1)
return result;
return MulTi(x, y - 1, result+x);
}