#include <bits/stdc++.h>

using namespace std;

#define ll long long
const ll MOD = 1e9 + 7;

ll ff[101];
ll f(int n) {
    if (ff[n]) return ff[n];
    if (n == 1) return 1;
    if (n == 2) return 2;
    if (n == 3) return 2;
    if (n == 4) return 3;
    if (n == 5) return 4;
    return ff[n] = (f(n - 1) + f(n - 5)) % MOD;
}

int main() {
    int n;
    cin >> n;
    cout << f(n) << endl;
    return 0;
}