#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) for(int i = (n) - 1; (i) >= 0; --i)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
#define MOD LL(1e9 + 7)
#define INF 1000000
using namespace std;
typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PI;

LL dp[1000001];

int main() {
	int n;
	cin >> n;
	dp[1] = 1; dp[2] = 2; dp[3] = 2;
	FOR(i, 3, n) {
		dp[i + 1] = (dp[i - 1] + dp[i - 2]) % MOD;
	}
	cout << dp[n] << endl;
	return 0;
}