#!/usr/koeki/bin/ruby

sum = 0
while copy_data = gets
  if /(\S+)\s+(\S+)\s+(\d+)/ =~ copy_data
    copy = $3.to_i
    if copy >= 30
      sum += copy * 7
    else sum += copy * 10
    end
  end
end

printf("本日の使用代金 %d 円\n",sum)