#include <cstdio>
#include <cstring>

using namespace std;

const int mod = 1e9+7;
int n;
long long dp[1111111][2][3];

long long solve(int a, int b, int c) {
  if (dp[a][b][c] >= 0) return dp[a][b][c];
  if (a == n) return 1;
  long long res = 0;
  if (b == 0) {
    if (c < 2) {
      res = (res+solve(a+1, 0, c+1))%mod;
    }
    if (c > 0) {
      res = (res+solve(a+1, 1, 0))%mod;
    }
  } else {
    res = (res+solve(a+1, 0, c+1))%mod;
  }
  return dp[a][b][c] = res;
}

int main(void) {
  scanf("%d", &n);
  memset(dp, -1, sizeof(dp));
  long long res = solve(0, 0, 0);
  printf("%lld\n", res);
  return 0;
}