#!/usr/koeki/bin/ruby

waribiki = 0.8			# 見切り品の割引倍率(2割引)

def mikiri(price, waribiki)		# mikiriメソッドの定義
  newprice = price*waribiki	# 割引倍率を掛けているつもり
  printf("%d円のところ%d円!!\n", price, newprice.to_i)
end

print("元の値段: ")
x = gets.to_i
mikiri(x, waribiki)