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 Java (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
import java.io.*;
import java.math.*;

public class Main {
    
    public static void main(String[] args) throws IOException {
        
        Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
        
       
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        
        System.out.println((long)(a * b));
        
      
        
        out.flush();
    }
}