Let I = S (4x3 +y) da + (3 y2 + 3 x + 3) dy, where & is the simple closed curve that consists of the line segment from A = (-1, 1) to B - (1, 1), followed counter clockwise from B to A by the ~ of the circle a2 + (y - 2)2 - 2. Then I = an + b, where a and b are respectively equal to