10 GRAPHICS 0:PRINT :PRINT "WORLD'S MOST EXPENSIVE ADDING MACHINE"›20 PRINT :PRINT "X=";›30 INPUT X›40 PRINT "Y=";›50 INPUT Y›60 SUM=USR(1536,X,Y)›70 PRINT "X+Y=";SUM›80 PRINT ›90 GOTO 20››