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: Wrong Answer)

# Code for C - Multiplication 3
# Use input() to fetch data from STDIN
from math import floor

[astr, bstr] = list(input().split())

a = int(astr)
[b1str, b2str] = bstr.split(".")

b1 = int(b1str) * 100
b2 = int(b2str)

print(floor(a * (b1 + b2) / 100))