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#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;

ll DP[300007];
ll P[300007];
ll a[300007];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,k,q;
    cin>>n>>k>>q;
    for(int i=1;i<=n;i++)
    {
        ll x;
        cin>>x;
        P[i]=P[i-1]+x;
    }
    for(int i=1;i<=n;i++) if(i>=k) a[i]=P[i]-P[i-k];
    while(q--)
    {
        int l,r;
        cin>>l>>r;
        for(int i=l;i<=r;i++)
        {
            DP[i]=DP[i-1];
            if(i-l+1>=k) DP[i]=max(DP[i],DP[i-k]+a[i]);
        }
        cout<<DP[r]<<endl;
        for(int i=l;i<=r;i++) DP[i]=0;
    }

    return 0;
}