#include<cstdio>

using ll=long long;

#define MOD 1000000007


int main(void)
{
	ll n;

	while(scanf("%lld", &n)==1)
	{
		ll ans=1;

		if(n&1) ans=3;
		for(ll i=n/2;i>0;i--)
		{
			if(i==1) ans=(ans*4)%MOD;
			else ans=(ans*5)%MOD;
		}
		if(n==1) ans=2;
		printf("%lld\n", ans);
	}
	return 0;
}