#218. Calculator
You get an expression `a op b` on one line. op is one of `+`, `-`, `*`, `/`. For `/` use integer division; if it divides by 0, print `Error`.
### Input
One line: a op b (separated by spaces).
### Output
The result.
Examples
Input
1 - 12
Output
-11
Input
41 + 20
Output
61
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.