S = int(eval(input()))



def cmb(n, r, p):

    if (r < 0) or (n < r):

        return 0

    r = min(r, n - r)

    return fact[n] * factinv[r] * factinv[n-r] % p



p = 10 ** 9 + 7

N = S  # N は必要分だけ用意する

fact = [1, 1]  # fact[n] = (n! mod p)

factinv = [1, 1]  # factinv[n] = ((n!)^(-1) mod p)

inv = [0, 1]  # factinv 計算用

 

for i in range(2, N + 1):

    fact.append((fact[-1] * i) % p)

    inv.append((-inv[p % i] * (p // i)) % p)

    factinv.append((factinv[-1] * inv[-1]) % p)



#print(cmb(n, r, p))



ans = 0

for i in range(S):

    ans += cmb(S - (i+1)*2 - 1, i, p)

    ans %= p

print(ans)
# -*- coding: utf-8 -*-



S = int(eval(input()))



def cmb(n, r, p):

    if (r < 0) or (n < r):

        return 0

    r = min(r, n - r)

    return fact[n] * factinv[r] * factinv[n-r] % p



p = 10 ** 9 + 7

N = S  # N は必要分だけ用意する

fact = [1, 1]  # fact[n] = (n! mod p)

factinv = [1, 1]  # factinv[n] = ((n!)^(-1) mod p)

inv = [0, 1]  # factinv 計算用

 

for i in range(2, N + 1):

    fact.append((fact[-1] * i) % p)

    inv.append((-inv[p % i] * (p // i)) % p)

    factinv.append((factinv[-1] * inv[-1]) % p)



#print(cmb(n, r, p))



ans = 0

for i in range(S//3):

    ans += cmb(S - (i+1)*2 - 1, i, p)

    ans %= p

print(ans)
S = int(eval(input()))


def cmb(n, r, p):
    if (r < 0) or (n < r):
        return 0
    r = min(r, n - r)
    return fact[n] * factinv[r] * factinv[n - r] % p


p = 10**9 + 7
N = S  # N は必要分だけ用意する
fact = [1, 1]  # fact[n] = (n! mod p)
factinv = [1, 1]  # factinv[n] = ((n!)^(-1) mod p)
inv = [0, 1]  # factinv 計算用
for i in range(2, N + 1):
    fact.append((fact[-1] * i) % p)
    inv.append((-inv[p % i] * (p // i)) % p)
    factinv.append((factinv[-1] * inv[-1]) % p)
# print(cmb(n, r, p))
ans = 0
for i in range(S):
    ans += cmb(S - (i + 1) * 2 - 1, i, p)
    ans %= p
print(ans)

# -*- coding: utf-8 -*-
S = int(eval(input()))


def cmb(n, r, p):
    if (r < 0) or (n < r):
        return 0
    r = min(r, n - r)
    return fact[n] * factinv[r] * factinv[n - r] % p


p = 10**9 + 7
N = S  # N は必要分だけ用意する
fact = [1, 1]  # fact[n] = (n! mod p)
factinv = [1, 1]  # factinv[n] = ((n!)^(-1) mod p)
inv = [0, 1]  # factinv 計算用
for i in range(2, N + 1):
    fact.append((fact[-1] * i) % p)
    inv.append((-inv[p % i] * (p // i)) % p)
    factinv.append((factinv[-1] * inv[-1]) % p)
# print(cmb(n, r, p))
ans = 0
for i in range(S // 3):
    ans += cmb(S - (i + 1) * 2 - 1, i, p)
    ans %= p
print(ans)

+# -*- coding: utf-8 -*- -for i in range(S): +for i in range(S // 3):