#include #include #include #include #include #include #define rep(i, n) for(i = 0; i < (n); i++) #define chmax(x, y) x = max(x, y) #define chmin(x, y) x = min(x, y) #define MOD 1000007 #define PI 3.14159265358979323846 #define INF 1 << 30 using namespace std; typedef long long ll; typedef pair pp; ll Ans(ll n) { ll x = n >> 1; n %= MOD; x %= MOD; return (-x * x + n * x + n) % MOD; } int main(void) { ll n, ans; cin >> n; ans = Ans(n); while (ans < 0) ans += MOD; cout << ans << "\n"; return 0; }