window.onload = startup;
var coffee;
var output;
function startup() {

  var submit = document.getElementById("formSubmit");
  submit.addEventListener("click", checkNumber);

 }

function checkNumber() {
    coffee = parseInt(document.getElementById("formAmount").value);
    output = document.getElementById("formResult");
    if(coffee <= 3){
        output.innerHTML = "You definitely need more coffee! How are you awake?";
      }
      else{
        output.innerHTML = "You need more coffee! You need at least "  +(coffee + 1)+ " cups in total";
    }

}