Problem: One very experienced problem writer decided to prepare a problem for April Fools Day contest. The task was very simple - given an arithmetic expression, return the result of evaluating this expression. However, looks like there is a bug in the reference solution...

Input

The only line of input data contains the arithmetic expression. The expression will contain between 2 and 10 operands, separated with arithmetic signs plus and/or minus. Each operand will be an integer between 0 and 255, inclusive.

Output

Reproduce the output of the reference solution, including the bug.

Examples

Input

8-7+6-5+4-3+2-1-0


Output

4


Input

2+2


Output

-46


Input

112-37


Output

375

Solution (in PYTHON):

Solution:
ch = raw_input()
ans = 0
preop = "+"
now = 0

for i in ch:
	if i.isdigit():
		now = now * 10 + ord(i) - 48
	else:
		if preop == "+":
			ans += now
		else:
			ans -= now
		preop = i
		now = ord(i) - 48

if preop == "+":
	ans += now
else:
	ans -= now
print ans