naturals

N = int(input())


def natural(n, filter_level) -> int:
    print(f"N-{n}")
    if n == 0:
        return 1
    s = 0
    for i in range(1, min(n // 2, filter_level) + 1):
        print(f"{n} : {n - i} + {i} fl:{filter_level}")
        s += natural(n - i, i) + 1
    return s


print(natural(N, N))