transform adobe javascript to aem formcalc

hello

I have this script 

// Get field values as numbers

    var v1 = +getField("Text2 ").value;

    var v2 = +getField("Text10").value;

    var v3 = +getField("Text12").value;    

      var v4 = +getField("Text11").value;   

// calculate this field value

    event.value = v1+v2+v3 - v4;

how can i transform it to aem FormCalc;