def get(x, y, lst, dct):
    if y < x:
        return dct[(x, y)]
    return lst[x]

def count(num):
    lst = [0, 1, 2]
    dct = {(2, 1): 1}
    if 3 > num:
        return lst[num]
    for x in range(3, num + 1):
        tale = 0
        for n in range(1, x):
            tale += get(x - n, n, lst, dct)
            dct[(x, n)] = tale
        lst.append(tale + 1)
    return lst[num] - 1

print(count(100))