def kenpa(n):
    if n == 1:
        return [1,0,0,0] # 終わり方が,ケンケンパ，ケンパケン，パケンケン，パケンパの順にメモ
    elif n == 2:
        return [1,1,0,0]
    elif n == 3:
        return [1,1,0,0]
    else:
        pre = kenpa(3)
        for i in range(n-3):
            ans = [pre[2]%1000000007,(pre[0]+pre[3])%1000000007,pre[1]%1000000007,pre[1]%1000000007]
            pre = ans
        return pre


N = int(input())
print(sum(kenpa(N))%(10**9+7))