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.

-----Sample Input-----
198 1.10

-----Sample Output-----
217

We have 198 \times 1.10 = 217.8. After truncating the fractional part, we have the answer: 217.