#!/usr/bin/env ruby
# -*- cding: utf-8 -*-

puts "数を入れてね"
puts "縦の長さは "
puts "横の長さは "
puts "a : 5"
puts "b : 8"

def nagasa (x, y)
  
  a * b =40

end

gets.to_i y = 5.z = 8
printf("%d\n",nagasa(y, z))