Score : $100$ points
Joisino wants to evaluate the formula "$A$ $op$ $B$".
Here, $A$ and $B$ are integers, and the binary operator $op$ is either
Your task is to evaluate the formula instead of her.
The input is given from Standard Input in the following format:
$A$ $op$ $B$
Evaluate the formula and print the result.
1 + 2
Since $1 + 2 = 3$, the output should be $3$.
5 - 7