Question: You are buying and selling items in the stock market. And, you keep your operations in a database (or in a file). Write a program that reads a list of stock market operations, then prints the total price of m items given.

Input specification: At the beginning, you will be given two integers: the number of operations (n) and the number of items (m) to show the total amount (total price). Each of the following n lines will have four information

• Item code: a string not more than 12 chars
• Buying or selling: a char (B or S, no other char will be given)
• The number of items to buy: an integer between 1 and 200
• Unit price: a floating point number not greater than 1000 (unit price to buy or sell this item)

Output specification: Show the total amount of m items. If the searching item is not in the list, assume that its total price is 0.

Explanation: There are 6 operations and the total price of 3 symbols have been asked in the end.

• Symbol LSUV has only one operation, so its total price is 72.8,
• ASYI has been bought twice and sold once, (20*8.90 + 18 7.30 - 13 8.80) with a total price of 195
• ANPFF has been bought once and sold once, (4*8.20 - 3*0.20) with a total price of 32.2