eimai o mpelsis xarika

sinolo_am=0
sinolo_gr=0
for i in range (40):
    onoma=input("Dwse to onoma sou: ")
    grapta=input("Dwse grapta: ")
    if grapta>=1 and grapta<=20:
        salary=grapta*1
    elif grapta>=21 and grapta<=40:
        salary=20*1+(grapta-20)*2
    elif grapta>40:
        salary=20*1+20*2+(grapta-40)*0.5
    sinolo_am=sinolo_am + salary
    sinolo_gr=sinolo_gr+grapta
print "Sinolo amoivi: ", sinolo_am, "Sinolo grapta: ",sinolo_gr