You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.

Description

Design a simple calculator that supports four operations: '+', '-', '*', and '/'.
Only consider integer input and output cases, and the data and operation results will not exceed the range of int.

Input Format

Input consists of a single line with three parameters: the first and second parameters are integers, and the third parameter is an operator ('+', '-', '*', '/', or other symbols).

Output Format

Output consists of a single line with one integer, the result of the operation. However:
If there is a division by zero, output: "Divided by zero!";
If there is an invalid operator (not one of '+', '-', '*', '/'), output: "Invalid operator!".

Sample

1 2 +

3