#include <cstdio>
#define repi(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,a) repi(i,0,a)
#define all(a) (a).begin(), (a).end()

constexpr int mod = 1000000007;

int N;
int dp[1000001][2][3];

int main()
{
  scanf( "%d", &N );

  dp[0][0][0] = 1;

  rep( i, N ) rep( j, 2 ) rep( k, 3 )
  {
    if( !j && k+1 < 3 )
      dp[i+1][0][k+1] = (dp[i+1][0][k+1]+dp[i][j][k]) % mod;
    if( j )
      dp[i+1][0][1] = (dp[i+1][0][1]+dp[i][j][k]) % mod;  

    if( !j && i )
      dp[i+1][1][0] = (dp[i+1][1][0]+dp[i][j][k]) % mod;
  }

  int ans = 0;

  rep( j, 2 ) rep( k, 3 )
    ans = (ans + dp[N][j][k]) % mod;

  printf( "%d\n", ans );
  
  return 0;
}