Joisino wants to evaluate the formula "A op B". Here, A and B are integers, and the binary operator op is either `+` or `-`. Your task is to evaluate the formula instead of her.

Constraints

* 1≦A,B≦10^9
* op is either `+` or `-`.

Input

The input is given from Standard Input in the following format:


A op B


Output

Evaluate the formula and print the result.

Examples

Input

1 + 2


Output

3


Input

5 - 7


Output

-2
s = raw_input()

a = s.find('+')
ok = 0
if a == -1:
	a = s.find('-')
	ok = 1

n1 = int(s[:(a - 1)])
n2 = int(s[(a + 1):])

if ok == 0:
	print n1 + n2
else:
	print n1 - n2