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().strip() + '+'
ans = 0

curr = 0
sign = 1
for c in s:
    if c in '-+':
        ans += sign*curr
        curr = 0
    if c == '-':
        sign = -1
    elif c == '+':
        sign = 1
    curr = curr*10 + (ord(c) - ord('0'))
print(ans)