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
#FLOW009
test = input()
while test > 0:
    test -= 1
    q,p = map(int, raw_input().split())
    mul = q*p
    if q >= 1000:
        print "%.6f" %  (mul - (mul / 10.0))
    else:
        print "%.6f" %  mul