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: Runtime Error)

program taskd;
var n1, n2, sum, min : longint;
    m : char;
begin
    sum := 0;
    min := 0;
    readln(n1, m, n2);
    if m = '+' then 
    begin
        sum := n1 + n2;
        writeln(sum)
    end;
    if m = '-' then 
    begin
        min := n1 - n2;
          writeln(min);
    end;
end.