Problem:
Score : 300 points

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.

Sample Input 1

198 1.10

Sample Output 1

217

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

Sample Input 2

1 0.01

Sample Output 2

0

Sample Input 3

1000000000000000 9.99

Sample Output 3

9990000000000000

Solution in Pascal (FPC 3.0.4) (judge verdict: Accepted)

var a,b2: int64;
    b: string;

function todigit(c : char) : integer;
begin
    todigit := ord(c) - ord('0');
end;

begin
    read(a,b);
    b2 := todigit(b[2]) * 100 + todigit(b[4]) * 10 + todigit(b[5]);
    writeln((a * b2) div 100);
end.