import std.stdio;
import std.algorithm;
import std.range;
import std.conv;
import std.format;
import std.array;
import std.math;
import std.string;
import std.container;

void main() {
  int N; readlnTo(N);
  auto dp = new int[][](1000001, 4);
  const int mod = 1000000007;

  dp[0][0] = 1;

  int val;
  foreach(i; 0..N) {
    foreach(j; 1..4) {
      if (i + j > N)
        continue;
      val = dp[i+j][j];
      foreach(k; 0..4) {
        if (j == k)
          continue;
        val = (val + dp[i][k]) % mod;
      }
      dp[i+j][j] = val;
    }
  }

  int ans = 0;
  foreach(i; 1..4)
    ans = (ans + dp[N][i]) % mod;

  ans.writeln;
}

// helpers
void readlnTo(T...)(ref T t) {
  auto s = readln.split;
  assert(s.length == t.length);
  foreach(ref ti; t) {
    ti = s[0].to!(typeof(ti));
    s = s[1..$];
  }
}