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#ifdef NDEBUG
#undef LOCAL
#endif
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using ll   = long long;
using ull  = unsigned long long;
using ld   = long double;
using pii  = pair<int,int>;
using pll  = pair<ll,ll>;
using vi   = vector<int>;
using vb   = vector<bool>;
using vc   = vector<char>;
using vvc  = vector<vc>;
using vvi  = vector<vi>;
using vvb  = vector<vb>;
using vpii = vector<pii>;
using vpll = vector<pll>;
using vll  = vector<ll>;
using vull = vector<ull>;
using vvll = vector<vll>;
using namespace __gnu_pbds;
template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define f first
#define s second
#define pb emplace_back
#define rep(i, begin, end) for(auto i = (begin); i <= (end); ++i)
#define repr(i, begin, end) for(auto i = (begin); i >= (end); --i)
#define bend(X) X.begin(), X.end()
constexpr int INF = 1e9+1e7;
constexpr ll INFl = INF;
constexpr ll INFll = 1e18+1e16;
#ifndef LOCAL
#define endl '\n'
#endif
template <typename T> void print(T x) { cout << x << endl; }
template <typename T, typename... Args> void print(T x, Args... args) { cout << x << ' '; print(args...); }
#ifdef LOCAL
template <typename T> void _deb(T x) { cout << x << endl; }
template <typename T, typename... Args> void _deb(T x, Args... args) { cout << x << ", "; _deb(args...); }
#define deb(...) do { cout << #__VA_ARGS__ << " = "; _deb(__VA_ARGS__); } while (false)
#define say(...) print(__VA_ARGS__);
template <typename T1, typename T2> ostream& operator<<(ostream& os, pair<T1,T2> x) { os << '(' << x.f << ", " << x.s << ')'; return os; }
template <typename Ch, typename Tr, typename T> ostream& operator<<(basic_ostream<Ch,Tr>& os, T x) { bool first = true; os << '['; for(auto i : x) { if (!first) os << ", "; os << i; first = false; } os << ']'; return os; }
#else
#define deb(...)
#define say(...)
template <typename T1, typename T2> ostream& operator<<(ostream& os, pair<T1,T2> x) { os << x.f << ' ' << x.s; return os; }
template <typename Ch, typename Tr, typename T> ostream& operator<<(basic_ostream<Ch,Tr>& os, T x) { for(auto i : x) os << i << ' '; return os; }
#endif
template <typename T1, typename T2> istream& operator>>(istream& is, pair<T1,T2>& x) { is >> x.f >> x.s; return is; }
template <typename T> istream& operator>>(istream& is, vector<T>& x) { for(T& i : x) is >> i; return is; }
template <typename T1, typename T2> pair<T1,T2> operator+(const pair<T1,T2>& A, const pair<T1,T2>& B) { return {A.f+B.f, A.s+B.s}; }
template <typename T1, typename T2> pair<T1,T2> operator-(const pair<T1,T2>& A, const pair<T1,T2>& B) { return {A.f-B.f, A.s-B.s}; }
template <typename T1, typename T2> pair<T1,T2>& operator+=(pair<T1,T2>& A, const pair<T1,T2>& B) { A.f += B.f; A.s += B.s; return A; }
template <typename T1, typename T2> pair<T1,T2>& operator-=(pair<T1,T2>& A, const pair<T1,T2>& B) { A.f -= B.f; A.s -= B.s; return A; }
template <typename T1, typename T2> pair<T1,T2> operator-(const pair<T1,T2>& A) { return {-A.f, -A.s}; }
template <typename T1, typename T2> bool maxe(T1& A, const T2& B) { if(B>A) { A=B; return 1; } return 0; }
template <typename T1, typename T2> bool mine(T1& A, const T2& B) { if(B<A) { A=B; return 1; } return 0; }
class Nic{} nic;
template <typename T> Nic operator<<(Nic, T) { return nic; }
Nic operator<<(ostream&, Nic) { return nic; }

//////////////////////////////////////////////////

int n, k, q;
vi T;
vll P, DP;

ll query(int l, int r) {
    rep (i, l-1, r) DP[i] = 0;
    rep (i, l+k-1, r)
        DP[i] = max(DP[i-1], DP[i-k] + P[i] - P[i-k]);
    return DP[r];
}

auto solve() {
    cin >> n >> k >> q;
    T.resize(n+1);
    P.resize(n+1);
    DP.resize(n+1);
    rep (i, 1, n) cin >> T[i];
    rep (i, 1, n) P[i] = P[i-1] + T[i];
    rep (i, 1, q) {
        int l, r;
        cin >> l >> r;
        print(query(l,r));
    }

    return nic;
}



int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int noOfTests = 1;
    //cin >> noOfTests;

    while(noOfTests --> 0)
        cout << solve() << '\n';

    return 0;
}