Dice Combinations

#include <bits/stdc++.h>
using namespace std;
#define int long long
int n;
int res[1000005];
int mod = 1e9+7;
main(){
    cin >> n;
    res[0]=1;
    for(int i = 1; i <= n ; i++){
        for(int j = 1; j <= 6 && i -j >= 0;j++)
            res[i]+=res[i-j];
        res[i]%=mod;
    }
    cout << res[n]<< endl;
}