import sys
for line in sys.stdin:
    line=line.split()
    a=int(line[0])
    b=int(line[1])
    c=int(line[2])
    d=int(line[3])
    e=int(line[4])
    if (d<e):
        V=a*b*c
        v=((a-2*e)*(b-2*e)+(b-2*e)*(c-2*e)+(a-2*e)*(c-2*e))*2*d
        ans=V-v
        print(ans)
    elif (d>=e):
        V=a*b*c
        v1=((a-2*e)*(b-2*e)+(b-2*e)*(c-2*e)+(a-2*e)*(c-2*e))*2*e
        v2=(a-2*e)*(b-2*e)*(c-2*e)
        ans1=V-v1-v2
        ans2=(a-2*d)*(b-2*d)*(c-2*d)
        print(max(ans1,ans2))