Compute $A \times B,$ truncate its fractional part, and print the result as an integer.

Constraints

• $0 \leq A \leq 10^{15}$
• $0 \leq B < 10$
• A is an integer.
• B is a number with two digits after the decimal point.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the answer as an integer.

Examples

Input

198 1.10

Output

217

Input

1 0.01

Output

0

Input

1000000000000000 9.99

Output

9990000000000000

见题面

见题面