import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)

N=int(input())
mod=10**9+7

from functools import lru_cache
@lru_cache(maxsize=None)
def calc(rest,x):
    if rest==0:
        return 1
    if x>rest:
        return 0

    ANS=0

    for i in range(rest//x+1):
        ANS+=calc(rest-i*x,x+1)
        ANS%=mod

    return ANS

print(calc(N,3))