module mult(
    input [15:0]A, B,
    output reg [15:0] C
    );

    reg[31:0] result;
    reg [15:0] lo, hi;

    always @(*) begin
       result = A * B;
       if (result == 32'b0)
        begin
            C = (-1) * A + (-1) * B + 1;
        end
       else
        begin
            hi = result >> 16;
            lo = result;
            if (lo > hi)
                begin
                    C = lo - hi;
                end
            else
                begin
                    C = lo - hi + 1;
                end
        end
    end
endmodule