racun = [10999, 15500, 34999, 102000, 49999, 3100]

if len(racun) < 3:
    print("Greska. Nemate dovoljno artikala na racunu.")
    exit()

racun.sort()
print(racun)
print("Tri najskuplja proizvoda: ")
print(racun[-1])
print(racun[-2])
print(racun[-3])