/** made by amunduzbaev **/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace __gnu_pbds;
using namespace __gnu_cxx;
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vll vector<ll>
#define vii vector<int>
#define vpii vector<pii>
#define vpll vector<pll>
#define cnt(a)__builtin_popcount(a)
template<class T> bool umin(T& a, const T& b) {return a > b? a = b, true:false;}
template<class T> bool umax(T& a, const T& b) {return a < b? a = b, true:false;}
typedef tree<pii,null_type,less<pii>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
const int N = 3e5+5;
const int mod = 1e9+7;
const ll inf = 1e18;
const ld Pi = acos(-1);
ll s, n, m, k, ans, ss[N], mm[N];
pii a[N], tmp[N];
void solve(){
cin>>n>>m>>s;
vector<pii> dif;
for(int i=0;i<n;i++){
cin>>a[i].ff>>a[i].ss;
dif.pb({a[i].ff - a[i].ss, i});
}
sort(all(dif));
for(int i=0;i<n;i++) tmp[i] = a[dif[i].ss];
priority_queue<int> tpp;
for(int i=n-1;i>=n-m;i--) { tpp.push(-tmp[i].ff); mm[i] = tmp[i].ff; if(i < n-1) mm[i] += mm[i+1]; }
for(int i=n-m-1;i>=0;i--){
int sub = 0, add = 0;
if(tmp[i].ff > tpp.top()*-1){
sub = tpp.top()*-1;
tpp.pop();
add = tmp[i].ff;
tpp.push(-tmp[i].ff);
}
mm[i] = mm[i+1] - sub + add;
}
while(!tpp.empty()) tpp.pop();
for(int i=0;i<s;i++){
tpp.push(-tmp[i].ss);
ss[i] = tmp[i].ss;
if(i) ss[i] += ss[i-1];
}
for(int i=s;i<n;i++){
int sub = 0, add = 0;
if(tmp[i].ss > tpp.top() * -1){
sub = tpp.top()*-1;
add = tmp[i].ss;
tpp.pop();
tpp.push(-tmp[i].ss);
}
ss[i] = ss[i-1] - sub + add;
}
for(int i=0;i<n;i++) ans = max(ans, ss[i] + mm[i+1]); //cout<<ss[i]<<" " <<mm[i]<<"\n";
cout<<ans<<"\n";
return;
}
int main(){
fastios
int t = 1;
if(t) solve();
else {
cin>>t;
while (t--) solve();
}
return 0;
}
