N = int(input())

P = 10 ** 9 + 7
S = (N-2) * (N-3) // 2
c = 0
if (N-4) % 3 == 0:
    c += 1
S2 = (N-4) // 2 + 1 - c
S3 = S - S2 * 3 - c
S3 //= 6
print((c + S2 + S3) % P)