# Second Bloop file
# Here, since we've shown that the functions s, plus, mult, and exp
# are all Bloop computable we write them more simply and efficiently
# using Ruby's built in functions +, *, and ** (exponent)

# hyperexp is defined by repeatedly applying 2 ** x
def hyperexp(a)
    ans = 1
    a.times do
       ans = 2 ** ans
    end
    return(ans)
end


a = ARGV[0].to_i
print "hyperexp( #{a} ) = #{hyperexp(a)} \n "