Simple Calculator

Easy#basics #conditionals· solved by 0 · time limit 2.0 s

Evaluate a op b where op is one of + - * /. For / print the integer quotient rounded toward zero (so -7 / 2 is -3). If dividing by zero, print Error.

Input

One line: integer $a$ , an operator, integer $b$ , separated by spaces.

Output

The result.

Constraints

$|a|, |b| \le 10^9$ — products may need 64 bits.

Sample 1

Input

7 + 5

Output

Sample 2

Input

-7 / 2

Output

-3