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

n = int(input())

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

dp = [1] * 8
for _ in [0] * (n - 3):
	ndp = [0] * 8
	ndp[0b000] = (dp[0b000] + dp[0b100]) % mod
	ndp[0b001] = (dp[0b000] + dp[0b100]) % mod
	ndp[0b010] = dp[0b001]
	ndp[0b011] = (dp[0b001] + dp[0b101]) % mod
	ndp[0b100] = (dp[0b010] + dp[0b110]) % mod
	ndp[0b101] = (dp[0b010] + dp[0b110]) % mod
	ndp[0b110] = (dp[0b011] + dp[0b111]) % mod
	ndp[0b111] = (dp[0b011] + dp[0b111]) % mod
	dp = list(ndp)

ans = (mod + pow(2,n,mod) - sum(dp) % mod) % mod
print(ans)