Calculator with Division

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

A calculator receives two integers a and b followed by an operator op from +, -, * and /. Compute the indicated operation. Division is C integer division, truncating toward zero; division by zero prints ERROR.

Input

One line contains a, b and then a single operator character op.

Output

Print the integer result or exactly ERROR if op is / and b = 0.

Subtasks

• Subtask 1 (20%): -10 <= a,b <= 10, op is + or -.
• Subtask 2 (30%): -1000 <= a,b <= 1000, op is +, -, * or /.
• Subtask 3 (50%): -10^6 <= a,b <= 10^6, op is +, -, * or /.

Examples

Example 1

Input

7 0 /

Output

ERROR

Explanation

The divisor is zero, so print ERROR.

Example 2

Input

-7 2 /

Output

-3

Explanation

C truncates -3.5 toward zero to -3.