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)

var
s,astr,bstr:ansistring;
sign:char;
a,b,lens,p:longint;
begin
   readln(s);
   lens:=length(s);
   if pos('+',s)<>0 then 
   begin
      p := pos('+',s);
	  sign:='+';
   end;
   if pos('-',s)<>0 then 
   begin
      p := pos('-',s);
	   sign:='-';
   end;
   astr:=copy(s,1,p-2);
   bstr:=copy(s,p+2,lens-p-1);
   val(astr,a);
   val(bstr,b);
   if sign='+' then writeln(a+b);
   if sign='-' then writeln(a-b);
end.