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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

process.stdin.resume();
process.stdin.setEncoding('utf8');
var input_string = '';

process.stdin.on('data', function (chunk) {
    input_string = chunk;
    const lines = input_string;
    const c = []
    c.push(lines.split(' ').map(value => parseFloat(value)));

    // console.log("c:", c);
    var A = c[0][0];
    var B = c[0][1];

    console.log(Math.floor(A * B));

});