import sys
sys.setrecursionlimit(2000)

n = int(input())

memo = {}

memo[(1, 0)] = 0
memo[(1, 1)] = 1
memo[(1, 2)] = 0

memo[(2, 0)] = 1
memo[(2, 1)] = 0
memo[(2, 2)] = 1

memo[(3, 0)] = 1
memo[(3, 1)] = 1
memo[(3, 2)] = 0


def dp(*t):

    if t in memo:
        return memo[t]
    else:
        memo[t] = dp_inner(*t)
        return memo[t]

def dp_inner(i, k):

    if k == 2:
        return dp(i-1, 0)
    elif k == 1:
        return dp(i-1, 2) + dp(i-1, 0)
    else:
        return dp(i-1, 1)

print((dp(n, 0) + dp(n, 1) + dp(n, 2))  % (10**9+7))