# Function - 3

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Implement a function $f(x,y)=x_{2}+sin(x⋅y)−y_{2}$.

## Input

Each line contains two real numbers $x$ and $y$.

## Output

For each test case print in a separate line the value of the function $f(x,y)$ with four digits after the decimal point.

## Examples

Input #1

Answer #1

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