def mult(a, b):
    ret = 0

    sinalA = a < 0
    if (sinalA == True):
        a = -a

    sinalB = b < 0
    if (sinalB == True):
        b = -b

    sinal = 1 if (sinalA == sinalB) else -1

    if (a == 0):
        ret = 0
    else:
        ret = b + mult(a-1, b)

    if (sinal == -1):
        ret = -ret
    return ret
#############################################################
vara = int(input(''))
varb = int(input(''))
print(mult(vara, varb))