p02659 AtCoder Beginner Contest 169 - Multiplication 3
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.

Examples

Input

198 1.10


Output

217


Input

1 0.01


Output

0


Input

1000000000000000 9.99


Output

9990000000000000
```python
a, b = input().split()
print((int(a)*round(float(b)*100))//100)
```