#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define dl double
#define st first
#define nd second
#define II pair <int, int>
using namespace std;
const int N = 5 + 1e5;
const int inf = 7 + 1e9;
struct Node {
ll a, b;
bool operator <(const Node &O) const {
return a > O.a;
}
};
int main() {
#define TASKNAME ""
ios_base :: sync_with_stdio (0);
cin.tie (0);
if ( fopen( TASKNAME".inp", "r" ) ) {
freopen (TASKNAME".inp", "r", stdin);
freopen (TASKNAME".out", "w", stdout);
}
int n, m, s;
cin >> n >> m >> s;
vector <Node> e(n + 1);
for (int i = 1; i <= n; i ++)
cin >> e[i].a >> e[i].b;
sort(e.begin() + 1, e.end());
vector <int> inqueue(n + 1, 0);
priority_queue <II> a1, a2;
ll ans = 0;
for (int i = 1; i <= m; i ++) {
ans += e[i].a;
inqueue[i] = 1;
a1.push({-e[i].a, i});
a2.push({e[i].b - e[i].a, i});
}
priority_queue <II> b1, b2;
for (int i = m + 1; i <= m + s; i ++) {
while (!a1.empty() && inqueue[a1.top().nd] != 1)
a1.pop();
while (!a2.empty() && inqueue[a2.top().nd] != 1)
a2.pop();
if (!a2.empty() && e[i].b - e[i].a < a2.top().st) {
int u = a2.top().nd;
ans += e[i].a + e[u].b - e[u].a;
inqueue[u] = 2;
inqueue[i] = 1;
a1.push({-e[i].a, i});
a2.push({e[i].b - e[i].a, i});
b1.push({e[u].a - e[u].b, u});
b2.push({-e[u].b, u});
}
else {
ans += e[i].b;
inqueue[i] = 2;
b1.push({e[i].a - e[i].b, i});
b2.push({-e[i].b, i});
}
}
if (s > 0) {
for (int i = m + s + 1; i <= n; i ++) {
while (!a1.empty() && inqueue[a1.top().nd] != 1)
a1.pop();
while (!a2.empty() && inqueue[a2.top().nd] != 1)
a2.pop();
while (!b1.empty() && inqueue[b1.top().nd] != 2)
b1.pop();
while (!b2.empty() && inqueue[b2.top().nd] != 2)
b2.pop();
ll delta1 = 0, delta2 = 0, delta3 = 0;
if (!a1.empty() && e[i].b + a1.top().st > -b1.top().st) {
int u = a1.top().nd, v = b1.top().nd;
delta1 = e[i].b + e[v].a - e[v].b - e[u].a;
}
if (e[i].b > -b2.top().st) {
int v = b2.top().nd;
delta2 = e[i].b - e[v].b;
}
if (!a2.empty() && -b2.top().st - e[i].a < a2.top().st) {
int u = a2.top().nd, v = b2.top().nd;
delta3 = e[u].b + e[i].a - e[v].b - e[u].a;
}
ll ma = max({delta1, delta2, delta3});
ans += ma;
if (ma == 0)
continue;
if (delta1 == ma) {
int u = a1.top().nd, v = b1.top().nd;
inqueue[u] = 0;
inqueue[v] = 1;
a1.push({-e[v].a, v});
a2.push({e[v].b - e[v].a, v});
inqueue[i] = 2;
b1.push({e[i].a - e[i].b, i});
b2.push({-e[i].b, i});
}
else if (delta2 == ma) {
int v = b2.top().nd;
inqueue[v] = 0;
inqueue[i] = 2;
b1.push({e[i].a - e[i].b, i});
b2.push({-e[i].b, i});
}
else {
int u = a2.top().nd, v = b2.top().nd;
inqueue[v] = 0;
inqueue[i] = 1;
a1.push({-e[i].a, i});
a2.push({e[i].b - e[i].a, i});
inqueue[u] = 2;
b1.push({e[u].a - e[u].b, u});
b2.push({-e[u].b, u});
}
}
}
cout << ans;
return 0;
}
