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,t,v:ansistring;
    i:longint;
    a,b:int64;
    x:boolean;
begin
  readln(s);
  x:=true;
  for i:=1 to length(s) do begin
    if (s[i]='+') or (s[i]='-') then begin
      if (s[i]='+') then x:=false;
      break;
    end;
  end;
  if (x=false) then begin
    val(copy(s,1,pos('+',s)-2),a);
    val(copy(s,pos('+',s)+2,length(s)),b);
    writeln(a+b);
  end
  else begin
    val(copy(s,1,pos('-',s)-2),a);
    val(copy(s,pos('-',s)+2,length(s)),b);
    writeln(a-b);
  end;
end.