BUENOS AIRES, March 30 (Reuters) - Argentina is seeking a first disbursement of more than 40% under a $20-billion program it is negotiating with the International Monetary Fund (IMF), Economy Minister Luis Caputo said on Sunday. (Reporting by Eliana Raszewski; Writing by Stefanie Eschenbacher; Editing by Clarence Fernandez) ((Stefanie.Eschenbacher@thomsonreuters.com;))