n = int(input())
mod = 10**9 + 7

if n <= 3:
    print(0)
    exit()

DP = [[0 for _ in range(8)] for _ in range(n + 1)]
for i in range(8):
    DP[3][i] = 1
for i in range(3, n):
    DP[i + 1][0] = DP[i][0] + DP[i][4]
    DP[i + 1][1] = DP[i][0] + DP[i][4]
    DP[i + 1][2] = DP[i][1]
    DP[i + 1][3] = DP[i][1] + DP[i][5]
    DP[i + 1][4] = DP[i][2] + DP[i][6]
    DP[i + 1][5] = DP[i][2] + DP[i][6]
    DP[i + 1][6] = DP[i][3] + DP[i][7]
    DP[i + 1][7] = DP[i][3] + DP[i][7]
    for j in range(8):
        DP[i + 1][j] %= mod

ans = pow(2, n, mod)
for i in range(8):
    ans -= DP[n][i]
    ans %= mod
print(ans)