import sys
input = sys.stdin.readline
N = int(input())
mod = 10 ** 9 + 7

dp = [0] * (N + 1)
dp[0] = 1
for k in range(3, N + 1):
  for j in range(N - k + 1):
    dp[j + k] += dp[j]
    dp[j + k] %= mod
print(dp[-1])