MOD = 10 ** 9 + 7

n = int(input())
if n < 4:
  print(0)
  exit()

dp = [[0 for _ in range(8)] for _ in range(n)]
for j in range(8):
  dp[2][j] = 1

for i in range(3, n):
  dp[i][0] = (dp[i - 1][0] + dp[i - 1][4]) % MOD
  dp[i][1] = (dp[i - 1][0] + dp[i - 1][4]) % MOD
  dp[i][2] = dp[i - 1][1]
  dp[i][3] = (dp[i - 1][1] + dp[i - 1][5]) % MOD
  dp[i][4] = (dp[i - 1][2] + dp[i - 1][6]) % MOD
  dp[i][5] = (dp[i - 1][2] + dp[i - 1][6]) % MOD
  dp[i][6] = (dp[i - 1][3] + dp[i - 1][7]) % MOD
  dp[i][7] = (dp[i - 1][3] + dp[i - 1][7]) % MOD

ans = pow(2, n, MOD)
for j in range(8):
  ans = (ans - dp[-1][j]) % MOD

print(ans)