>>> counter, chislo = 0, 7788899 >>> while chislo <= 9988877: seven, eight, nine = 0, 0, 0 chislost=str(chislo) for i in range(len(chislost)): if chislost[i]=='7': seven += 1 if chislost[i]=='8': eight += 1 if chislost[i]=='9': nine += 1 if (seven, eight, nine) == (2, 3, 2): counter += 1 chislo += 1 >>> counter 210