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:
ans=0
op=1
now=0
s=input()
l=len(s)
for i in range(l):
    if s[i]=='+':
        ans=ans+op*now
        now=0
        op=1
    elif s[i]=='-':
        ans=ans+op*now
        now=0
        op=-1
    now=now*10+ord(s[i])-48
ans=ans+op*now
print(ans)