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 PYTHON3):

Solution:
s = input()

a = 1
b = 0
res = 0
for c in s:
	if (c == '+'):
		res = res + a * b
		a = 1
		b = 0
	elif (c == '-'):
		res = res + a * b
		a = -1
		b = 0
	b = b * 10 + ord(c) - 48
res = res + a * b

print(res)