C = (?a..?z).reduce({}){|s,e| s[e]=gets.to_i; s}

# helloworld
# hellloowrd

hewrd = C[?h]*C[?e]*C[?w]*C[?r]*C[?d]

o = C[?o]
o = o/2*((o+1)/2)

l = C[?l]
bestl = 0
(1..(l-1)).each do |l1|
    l2 = l-l1
    bestl = [bestl, l1*l2*(l2-1)/2].max
end

p hewrd*o*bestl