import sys
input = sys.stdin.readline
MOD = 10 ** 9 + 7

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

dp = [[0] * 8 for _ in range(n + 1)]
for j in range(8):
    dp[3][j] = 1
for i in range(3, n):
    dp[i + 1][0] = (dp[i][0] + dp[i][4]) % MOD
    dp[i + 1][1] = (dp[i][0] + dp[i][4]) % MOD
    dp[i + 1][2] = dp[i][1] % MOD
    dp[i + 1][3] = (dp[i][1] + dp[i][5]) % MOD
    dp[i + 1][4] = (dp[i][2] + dp[i][6]) % MOD
    dp[i + 1][5] = (dp[i][2] + dp[i][6]) % MOD
    dp[i + 1][6] = (dp[i][3] + dp[i][7]) % MOD
    dp[i + 1][7] = (dp[i][3] + dp[i][7]) % MOD
    
ans = (pow(2, n, MOD) - sum(dp[n])) % MOD
print(ans)