> java.lang.NumberFormatException: 
>      at java.lang.Integer.parseInt(+271)
>      at java.lang.Integer.parseInt(+6)
>      at calcular.commandAction(+164)
>      at javax.microedition.lcdui.Display$DisplayAccessor.commandAction(+152)
>      at com.sun.kvem.midp.lcdui.EmulEventHandler$EventLoop.run(+459)