Multiplication 3

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

inputFormat

Input

Input is given from Standard Input in the following format:

A B

outputFormat

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

样例

1000000000000000 9.99

9990000000000000