function onEdit()
{
  var sheet = SpreadsheetApp.getActiveSheet();

  var total1 = sheet.getRange("F3");
  var change1 = sheet.getRange("H4");
  var total1num = total1.getValue();

  var total2 = sheet.getRange("F7");
  var change2 = sheet.getRange("H8");
  var total2num = total1.getValue();

  var total3 = sheet.getRange("F11");
  var change3 = sheet.getRange("H12");
  var total3num = total1.getValue();

  var total4 = sheet.getRange("F15");
  var change4 = sheet.getRange("H16");
  var total4num = total1.getValue();

  if (change1.getValue() !== "")
  {
    total1num = total1num + change1.getValue();
    total1.setValue(total1num);
    change1.setValue("");
  }

    if (change2.getValue() !== "")
  {
    total2num = total2num + change2.getValue();
    total2.setValue(total2num);
    change2.setValue("");
  }

    if (change3.getValue() !== "")
  {
    total3num = total3num + change3.getValue();
    total3.setValue(total3num);
    change3.setValue("");
  }

    if (change4.getValue() !== "")
  {
    total4num = total4num + change4.getValue();
    total4.setValue(total4num);
    change4.setValue("");
  }
}