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 Python (3.8.2) (judge verdict: Runtime Error)

import math

num1= str(input()) #take input as a string
num2= str(input())

num1=str(num1)
num2=str(num2)

result= int(num1)*float(num2) #calculate the multiplication of inputs as integer and float
result= math.floor(result) #rounding down the output using floor function

print(result)