Verified answer

Program JolieWErnAje;
uses crt;
const n=10;
var
  a:array[1..n,1..n] of integer;
  i,j: integer;
  tp: integer;
begin
  writeln('*** alphaues is thinking... ***');
  writeln('***          OK             ***');
  writeln();
  tp:=1;
  randomize;
  for i:=1 to n do
    begin
      for j:=1 to n do
        begin
          a[i,j]:= random(20)+1; {заполняем массив}
          write(a[i,j]:4);
          if a[i,j] mod 3 = 0 then tp:=tp*a[i,j];
        end;
      writeln();
    end;
  writeln();
  writeln('Произведение элементов, кратных 3, равно ',tp)
end.