# 直前の2ムーブ[KK, KP, PK]で数え上げる
N = int(input())
mod = 10**9+7
dp = [[0]*3 for i in range(max(N, 2)+1)]
# 1歩目はK
dp[2][0] = 1
dp[2][1] = 1
dp[2][2] = 0

for i in range(3, N+1):
    dp[i][0] += dp[i-1][2]
    dp[i][1] += dp[i-1][0]+dp[i-1][2]
    dp[i][2] += dp[i-1][1]
    dp[i][0] %= mod
    dp[i][1] %= mod
    dp[i][2] %= mod
    #print(dp[i])

ans = sum(dp[N])%mod
if N == 1:
    print(1)
else:
    print(ans)