Order value with a header

Problem

A CSV report has the header id,price,qty. Using DictReader, print the total order value (price times quantity, summed) with 2 decimals.

Input: First line: n, the number of lines that follow. Then n lines: the header, then n - 1 rows.
Output: The total with exactly 2 decimals.
Constraints: 2 ≤ n ≤ 100
price is a decimal number, qty is an integer

Example

Input

3
id,price,qty
1,250.5,2
2,99.99,3

Output

800.97

501.00 + 299.97 = 800.97.

Try the problem first. Open one hint at a time.

Hint 1

csv.DictReader accepts a list of lines, and the first line is the header.

Hint 2

Use float for the price and int for the quantity.

Write your Python code, run it on the examples and submit it to hidden tests.