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)

#!/usr/local/bin/python3
# coding: utf-8

ha = input()
kita = ha.split(" ")
a = int(kita[0])
b = int(kita[1].replace(".",""))
m = a*b
m = str(m)

c = kita[1].split(".")
try:
    co = len(c[1])
except:
    co = 0
print(m)
if a==0 or float(kita[1]) < 1:
    print("0")
elif co > 0:
    print(m[:-1*co])
else:
    print(m)