TVSH

After the new TVSH (Value Added Tax) regulation, government is planning some changes now. There will be three types of taxes

1. Medical expenses: 6%
2. Educational expenses: 10%
3. Others: 20%

Question: Write a program that gets the type and amount of n expenses, and then it calculates the total tax to be paid.

Input specification
You will be first given one integer(n). Then, in the following n lines, you will be given 2 integers (information for each expense):

• the type: an integer between 1 and 3 ( 1 is Medical expense, etc.)
• and the amount (base price before tax is added) an integer between 1 and 10,000

where 0 ≤ n ≤ 10,000.

Output specification
Show one number (with two digits after the floating point): total amount of tax to be paid.

Sample Input I 2 1 1000 3 500	Sample Input II 6 3 2000 2 1100 2 400 3 900 1 1900 3 500
Sample Output I 160	Sample Output II 944

Explanation for sample 1: The tax for the first item is 60leke and the tax for the second item is 100leke. So, the total amount of tax to be paid is 160leke.