Problem Statement

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.