#include <stdio.h>
const unsigned int mod=1e9+7;
unsigned int dp[1000010][3];

int main()
{
    int i, n;
    scanf("%d", &n);
    dp[0][0]=1;
    for(i=1;i<=n;++i) {
        if ((dp[i][1]+=dp[i-1][0])>=mod) dp[i][1]-=mod;
        if ((dp[i][2]+=dp[i-1][1])>=mod) dp[i][2]-=mod;
        if ((dp[i][0]+=dp[i-1][1])>=mod) dp[i][0]-=mod;
        if ((dp[i][0]+=dp[i-1][2])>=mod) dp[i][0]-=mod;
    }
    int res=0;
    for(i=0;i<3;++i) if ((res+=dp[n][i])>=mod) res-=mod;
    printf("%d\n", res);
    return 0;
}