dem23.n23

def f(a,b):
    if a == b:
        return 1
    if a > b:
        return 0
    return f(a + 1, b) + f(a * 2, b)

A = f(1,10) * f(10,35)
B = f(1,10) * f(10,17) * f(17,35)
C = A - B
print(C)