Problem:
Score : 100 points

Problem Statement

Joisino wants to evaluate the formula "A op B".
Here, A and B are integers, and the binary operator op is either + or -.
Your task is to evaluate the formula instead of her.

Constraints

1≦A,B≦10^9

op is either + or -.

Input

The input is given from Standard Input in the following format:

A op B

Output

Evaluate the formula and print the result.

Sample Input 1

1 + 2

Sample Output 1

3

Since 1 + 2 = 3, the output should be 3.

Sample Input 2

5 - 7

Sample Output 2

-2

Solution in Pascal (FPC 3.0.4) (judge verdict: Accepted)

Uses sysutils;
var a,b:longint;
    c:string;
    s:ansistring;
begin
    read(s);
    a:=strtoint(copy(s,1,pos(' ',s)-1));
    c:=copy(s,pos(' ',s)+1,1);
    b:=strtoint(copy(s,pos(' ',s)+3,length(s)-pos(' ',s)-2));
    if c='+' then
        writeln(a+b)
    else
        writeln(a-b);
end.