begin
  write('3 + 4 * 5 = ');
  writeln(3 + 4  * 5);
  write('1 - 1 - 1 = ');
  writeln(1 - 1 - 1);
  write('1 - (1 - 1) = ');
  writeln(1 - (1 - 1));
end