function Looping() {
  var app = SpreadsheetApp;
  var loopActiveSheet = app.getActiveSpreadsheet().getActiveSheet();
  //var someCell = loopActiveSheet.getRange(8,1).getValue();
  //someCell = someCell+5;
  //loopActiveSheet.getRange(9,1).setValue(someCell+5);
  //Logger.log(someCell);
  //------------
  for (var i=8;i<12;i++){
  var someCell = loopActiveSheet.getRange(i,1).getValue();
  someCell = someCell+5;
  loopActiveSheet.getRange(i,2).setValue(someCell+5);
  //-----------
  //Logger.log('hello');
  //Logger.log(i);
  }
}