Four-Operation Calculator

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

A calculator receives integers a and b and an operator +, -, * or /. Compute the indicated integer operation. Division by zero prints ERROR. Integer division truncates toward zero, for example -7/2 = -3.

Input

One line contains integer a, an operator character op, then integer b.

Output

Print the integer operation result; print ERROR for division by zero.

Subtasks

• Subtask 1 (20%): 0 <= a,b <= 10 and op is + or -.
• Subtask 2 (30%): -100 <= a,b <= 100 and op is +, - or *.
• Subtask 3 (50%): -10^6 <= a,b <= 10^6 and op is +, -, * or /.

Examples

Example 1

Input

7 / 2

Output

3

Explanation

Integer division of 7 by 2 yields 3.

Example 2

Input

7 / 0

Output

ERROR

Explanation

The divisor is zero, so division is not evaluated.