B. Expression
time limit per test
2 seconds
memory limit per test
64 megabytes
input
stdin
output
stdout

You are given a line «n#m», where «n» and «m» are digits, and «#» is a sign «+» or «-». Print the value of the given expression.

Input

The only given line has a string in form «n#m», where «n» and «m» are digits (from 0 to 9), and «#» is a sign «+» or «-».

Output

Print the value of the given expression.

Examples
Input
1-5
Output
-4