#include <algorithm>
#include <complex>
#include <cstdlib>
#include <ctime>
#include <time.h>
#include <iomanip>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <numeric>
#include <limits>
#include <type_traits>
#include <locale>
#include <omp.h>

using namespace std;
#define SAY_YES cout << "YES" << endl;
#define SAY_Yes cout << "Yes" << endl;
#define SAY_NO cout << "NO" << endl;
#define SAY_No cout << "No" << endl;
#define IFYES(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "YES" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "NO" << endl;  \
    }
#define IFYes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "Yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "No" << endl;  \
    }
#define IFyes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "no" << endl;  \
    }
#define DEBUG_OUTPUT_ARRAY(XXX, ONE)                            \
    for (int i = 0; i < (ONE); i++)                             \
    {                                                           \
        cout << "DEBUG: i = " << i << " -> " << XXX[i] << endl; \
    }
#define DEBUG_OUTPUT_ARRAY2(XXX, ONE, TWO)                             \
    for (int i = 0; i < (ONE); i++)                                    \
    {                                                                  \
        cout << "<<< i = " << i << " >>>" << endl;                     \
        for (int j = 0; j < (TWO); j++)                                \
        {                                                              \
            cout << "DEBUG: j = " << j << " -> " << XXX[i][j] << endl; \
        }                                                              \
    }
#define DEBUG_OUTPUT_ARRAY2_BOX(XXX, ONE, TWO) \
    for (int i = 0; i < (ONE); i++)            \
    {                                          \
        cout << i << "  ";                     \
        for (int j = 0; j < (TWO); j++)        \
        {                                      \
            cout << XXX[i][j] << " ";          \
        }                                      \
        cout << endl;                          \
    }

typedef pair<long long int, long long int> pll;
typedef pair<long long int, pll> lpll;

const long long int mod = 1000000007;
const long long int INF = 1e18;
const long double PI=3.14159265358979323; 
//const long long int pl=1000000;

long long int dp[1000050][4]={};
long long int N,res=0,a,b,c,d,sum=0,cou=0,cou2=0;
bool AllSame=true;


//階乗先に計算
class Kaizyou{
    public:
    long long int *kaizyou;
    Kaizyou(){};
    Kaizyou(long long int n,long long int mod){
        kaizyou=new long long int[n+1];
        kai(1,n,mod);
        return;
    }

    long long int kai(long long int a, long long int b, long long int mod) {
        long long int tmp = 1;
		kaizyou[0]=1;
        for (long long int i = a; i <= b; i++) {
            tmp *= i;
            tmp %= mod;

            kaizyou[i] = tmp;
        }
        return tmp;
    }
};

//累乗(繰り返し2乗法)　aのb乗(mod)を求める。
class Ruizyou{
    public:
    long long int rui(long long int a, long long int b, long long mod) {
        int memo[65] = {};
        long long int A[65] = {};
        long long int tmp = 1;
        for (int i = 0; i < 65; i++) {
            memo[i] = b % 2;
            b /= 2;
        }

        A[0] = a;
        A[0] %= mod;

        for (int i = 1; i < 65; i++) {
            A[i] = A[i - 1] * A[i - 1];
            A[i] %= mod;
        }
        for (int i = 0; i < 65; i++) {
            if (memo[i] == 1) {
                tmp *= A[i];
                tmp %= mod;
            }
        }
        tmp %= mod;
        return tmp;
    }
};
//コンビネーション計算
class Combination{
    public:
        Kaizyou * Kaizyou_Instance;
        Ruizyou Ruizyou_Instance;
		long long int CombinationMod;
    Combination(long long int n,long long int mod){
        Kaizyou_Instance=new Kaizyou(n,mod);
		CombinationMod=mod;
    }
    long long int comb(long long int n, long long int r) {
        long long int tmp;
		if(r>n){return 0;}
        tmp = (Kaizyou_Instance->kaizyou[n] * Ruizyou_Instance.rui(Kaizyou_Instance->kaizyou[r], CombinationMod - 2, CombinationMod)) % CombinationMod;
        tmp *= Ruizyou_Instance.rui(Kaizyou_Instance->kaizyou[n - r], CombinationMod - 2, CombinationMod);
        tmp %= CombinationMod;
        if (tmp < 0) { tmp = (CombinationMod - tmp) % CombinationMod; }
        return tmp;
    }
	//start~endまでのn+iCiの和を出力
	long long int combRange1(long long int n,long long int start,long long int end){
		if(start!=0)return (comb(n+end+1,end)-comb(n+start,start-1)+3*CombinationMod)%CombinationMod;
		else return comb(n+end+1,end)%CombinationMod;
	}
	//start1~end1のiとstart2~end2のjまでのi+jCiの和を出力
	long long int combRange2(long long int start1,long long int end1,long long int start2,long long int end2){
		return (comb(end1+end2+2,end1+1)-comb(end1+start2+1,start2)-comb(end2+start1+1,start1)+comb(start1+start2,start1)+5*CombinationMod)%CombinationMod;		
	}
	
	long long int Lucas(long long int n,long long int r){
        long long int ret=1;
        while(r!=0){
            ret*=comb(n%CombinationMod,r%CombinationMod);
            n/=CombinationMod;
            r/=CombinationMod;
        }
        return ret%CombinationMod;
    }
};	



string S[105];
int main(){
    cout << fixed << setprecision(18);
    cin>>N;
    Combination Com(3*N,mod);
    for(long long int i = N-3; i >=0; i-=3){
        long long int num=(N-i)/3;
        res+=Com.comb(num-1+i,i);
    }
    cout<<res%mod<<endl;
    
}



Measured memory_bytes: 3640