numbers = input()
n, h, v = numbers.split(' ')
n = int(n)
h = int(h)
v = int(v)
cake1 = h*v
cake2 = h*(n-v)
cake3 = (n-h)*v
cake4 = (n-h)*(n-v)

if cake1>cake2:
    if cake1>cake3:
        if cake1>cake4:
            cake = cake1
        else:
            cake = cake4
    else:
        if cake3>cake4:
            cake = cake3
        else:
            cake = cake4
else :
    if cake2>cake3:
        if cake2>cake4:
            cake = cake2
        else : 
            cake = cake4
    else :
        if cake3 > cake4 :
            cake = cake3 
        else:
            cake = cake4

cake = cake*4
print(cake)