mod = 1000000007


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())

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


if __name__ == '__main__':
    main()