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:
ans,t,op=0,0,'+'
for ch in raw_input():
    if ch.isdigit():
        t=t*10+ord(ch)-0x30
    else:
        ans+=(t if op=='+' else -t)
        op=ch
        t=ord(ch)-0x30
print ans + (t if op=='+' else -t)