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 PyPy3 (7.3.0) (judge verdict: Wrong Answer)

li=input().split()
a = int(li[0])
b = float(li[1])
from decimal import Decimal, ROUND_HALF_UP
def remove_representation_error_in_float(x):
    x = Decimal(str(x)).quantize(Decimal('0.000000000000001'), rounding=ROUND_HALF_UP)
    x = float(str(x))
    return x
bb = remove_representation_error_in_float(b)
print(int(a*b))