While purchasing certain items, a discount of 10% is offered if the quantity purchased is more than 1000. If the quantity and price per item are input, write a program to calculate the total expenses.


Input

The first line contains an integer T, total number of test cases. Then follow T lines, each line contains integers quantity and price.


Output
Output the total expenses while purchasing items.

Constraints

1 ≤ T ≤ 1000
1 ≤ quantity,price ≤ 100000


Example

Input

3 
100 120
10 20
1200 20

Output

12000.000000
200.000000
21600.000000
def TotalExpenses(a, b):
    if a <= 1000:
        return "{0:.6f}".format(a * b)
    else:
        return "{0:.6f}".format((a*b)*.9)

case = int(raw_input())

while case > 0:
    a, b = map(float, raw_input().split())
    print TotalExpenses(a, b)
    case -= 1