In this problem, you will create a program that reads two integers and an operator (+, -, *, /, or %) from standard input, performs the specified arithmetic operation, and displays the result to standard output.

Problem Overview

Create a simple calculator that inputs two integers and an operator, then displays the calculation result.

Input Format

Receive 3 lines of input:

1. First integer
2. Second integer
3. operator (+, -, *, /, or %)

Output Format

Display the result in the following format:

[number1] [operator] [number2] = [result]
```java

## Notes

- Integer division truncates decimal places
- Display "Invalid operator" for invalid operators.