SCREEN 13: WINDOW SCREEN (0, 0)-(1000, 1000) CLS I = 500 C = 32 DO UNTIL C = 63 CIRCLE (500, 1000), I, C PAINT (500, 1000), C, C CIRCLE (500, 1000), I - 15, C I = I - 16 C = C + 1 LOOP A$ = INPUT$(1)