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)

program task1016;
var
    a,b,c : ansistring;
    x,y,i,t : int64;
    sum : int64;
begin
    read(a);
    sum := 0;
    b := a;
    c := a;
    delete(b,pos(' ',a),length(a)-pos(' ',a)+1);
    val(b,x,i);
    //writeln(b);
    delete(a,1,pos(' ',a)+2);
    val(a,y,t);
    //writeln(a);
    if c[pos(' ',c) + 1] = '+' then
        sum := x + y
    else 
        sum := x - y;
    writeln(sum);
end.