6870: ABC169 —— C - Multiplication 3
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Description
Compute $A \times B$, truncate its fractional part, and print the result as an integer.
Input
Input is given from Standard Input in the following format:
$A\ B$
$A\ B$
Output
Print the answer as an integer.
Constraints
$0≤A≤10^{15}$
$0 \leq B < 10$
$A$ is an integer.
$B$ is a number with two digits after the decimal point.
$0 \leq B < 10$
$A$ is an integer.
$B$ is a number with two digits after the decimal point.
Sample 1 Input
198 1.10
Sample 1 Output
217
We have $198 \times 1.10 = 217.8$. After truncating the fractional part, we have the answer: $217$.
Sample 2 Input
1 0.01
Sample 2 Output
0
Sample 3 Input
1000000000000000 9.99
Sample 3 Output
9990000000000000