Changes made by Regulation (EU) 2015/779 of the European Parliament and of the Council of 20 May 2015 amending Regulation (EU) No 1304/2013, as regards an additional initial prefinancing amount paid to operational programmes supported by the Youth Employment Initiative: Regulation (EU) No 1304/2013 of the European Parliament and of the Council of 17 December 2013 on the European Social Fund and repealing Council Regulation (EC) No 1081/2006