Поляков 5 — 222

k=0
for i in range(800,901):
    i = str(i)
    mas = [i[0], i[1], i[2]]
    mas = sorted(mas, reverse=True)
    if int(mas[2])!=0:
        a = int(mas[0]+mas[1])-int(mas[2]+mas[1])
    else:
        a = int(mas[0]+mas[1])-int(mas[1]+mas[2])
    if a == 30:
        k=k+1
print(k)