MOD = 10**9 + 7

n = int(input())
if n < 3:
    print(0)
else:
    dp = [0] * (n + 1)
    dp[0] = 1
    for k in range(3, n + 1):
        for j in range(k, n + 1):
            dp[j] = (dp[j] + dp[j - k]) % MOD
    print(dp[n] % MOD)