def scan; gets.split.map(&:to_i); end

q = ['+','-','*']

k = gets.to_i;
aa = scan

s = -999999999
q.repeated_permutation(k-1){|qq|
    e = "("*(k-1)+aa[0].to_s
    (k-1).times{|j|
        e << qq[j] << "#{aa[j+1]})"
    }
    s = [s,eval(e)].max
}

p s