Problem:
Score : 100 points

Problem Statement

Compute A \times B.

Constraints

1 \leq A \leq 100

1 \leq B \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the value A \times B as an integer.

Sample Input 1

2 5

Sample Output 1

10

We have 2 \times 5 = 10.

Sample Input 2

100 100

Sample Output 2

10000

Solution in Pascal (FPC 3.0.4) (judge verdict: Wrong Answer)

program main;
var i, n : int64;
    m : array [1..10000] of longint;
    p : qword = 1;
    c : boolean = false;
    z : boolean = false;
 
begin
  readln(n);
  for i := 1 to n do
    read(m[i]);
  readln;
  for i := 1 to n do
    if (m[i] = 0) then begin
      z := true;
      break;
    end;
  if not(z) then
    for i := 1 to n do
      if p*m[i] > 1e18 then begin
        c := true;
        break;
      end
      else p := p * m[i];
  if z then
    writeln(p-p)
  else if c then
    writeln('-1')
  else writeln(p);
end.