W, H = map(int, input().split())

if W == 0 or H == 0:
    if W == 0 and H == 0:
        print(0)
    else:
        print(max(W, H))
else:
    if W >= H:
        print(W * H + (W + H - 2))
    else:
        print(W * H + W + 1)