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#include <bits/stdc++.h>
#include <iostream>

//#define TEST

using namespace std;

#define FAST  ios_base::sync_with_stdio(0) ;cin.tie(0);

#define pb push_back
#define mp make_pair

#define fi(a, b) for(int i=a; i<=b; i++)
#define fj(a, b) for(int j=a; j<=b; j++)
#define fo(a, b) for(int o=a; o<=b; o++)

#define fdi(a, b) for(int i=a; i>=b; i--)
#define fdj(a, b) for(int j=a; j>=b; j--)
#define fdo(a, b) for(int o=a; o>=b; o--)

#define sz(x) (int)x.size()

#define init_v( tab, n ) fo(1, n ) tab.pb(0)

typedef long long ll;
typedef long double ld;
typedef vector <int> vi;
typedef pair <int, int> pii;
typedef vector <pii> vpii;
typedef pair <ll, ll> pll;
typedef vector <pll> vpll;
typedef vector <ll> vll;

template <typename T> ostream& operator<<( ostream& os, vector<T> v)
{
    fi(0, sz(v) - 1)   os << v[i] << " ";
    return os;
}
template <typename A, typename B> ostream& operator <<(ostream& os, pair< A, B> p)
{
    os << "(" << p.first << ", " << p.second << ")";
    return os;
}
template <typename T> ostream& operator<<( ostream& os, set<T> t)
{
    for (auto z : t)
    {
        os << z << " ";
    }
    return os;
}
template <typename T1, typename T2> ostream& operator <<(ostream& os, map< T1, T2> t)
{
    cerr << endl;
    for (auto z : t)
    {
        os << "\t" << z.first << " -> " << z.second << endl;
    }
    return os;
}

#ifdef TEST
#define dbg(x) {cerr << __LINE__ << "\t" << #x << ": " << x << endl;}
#define dbg0(x, n) {cerr << __LINE__ << "\t" << #x << ": "; for (int ABC = 0; ABC < n; ABC++) cerr << x[ABC] << ' '; cerr << endl;}
#else
#define dbg(x) ;
#define dbg0(x, n) ;
#endif

void przekierowanie()
{
#ifdef TEST
    freopen( "input.txt", "r", stdin );
    freopen( "output.txt", "w", stdout );
#endif
}

#define MAXN 300005

long n, k, q;
vector <ll> ciag( MAXN );
vector <ll> maksy( MAXN );
vector <ll> sumy_k( MAXN );

void task( long left, long right )
{
#ifdef TEST
    cout << "task\n";
    cout << left << " " << right << endl;
    for( long b = left; b <= right; b ++ )
        cout << ciag[ b ] << " ";
    cout << endl;
#endif // TEST
    for( long b =right; b >= left; b -- )
    {
        if( b > right - k + 1)
            sumy_k[ b ] = 0;
        else if( b == right - k + 1)
        {
            ll pom = ciag[ b ];
            for( long c = b + 1; c <= right; c ++ )
                pom += ciag[ c ];
            sumy_k[ b ] = pom;
        }
        else
            sumy_k[ b ] = ciag[ b ] + sumy_k[ b + 1 ] - ciag[ b + k ];
    }
    for( long b =right; b >= left; b -- )
    {
        if( b >= right - k + 1)
            maksy[ b ] = sumy_k[ b ];
        else
        {
            ll maks_forward = 0;
            for( long c = b + k; c < b + 2 * k; c ++ )
                if( c <= right )
                    maks_forward = max( maks_forward, maksy[ c ] );
            ll d = maks_forward + sumy_k[ b ];
            for( long e = b + 1; e <= b + k - 1; e ++ )
                d = max( d, maksy[ e ] );
            maksy[ b ] = d;
        }
    }
#ifdef TEST
    for ( long i = left; i <= right; i ++ )
        cout << sumy_k[ i ] << " ";
    cout << endl;
    for ( long i = left; i <= right; i ++ )
        cout << maksy[ i ] << " ";
    cout << endl;
#endif

    ll wynik = 0;
    for( long a = left; a<= min(right, left + k - 1); a ++ )
        wynik = max( wynik, maksy[ a ] );
    cout << wynik << '\n';
}

int main()
{
    FAST
    przekierowanie();

    cin >> n >> k >> q;

    for( long i = 1; i <= n; i ++ )
        cin >> ciag[ i ];

    for( long i = 1; i <= q; i ++)
    {
        long left, right;
        cin >> left >> right;
        task( left, right );
    }

    return 0;
}