#include <bits/stdc++.h>
using namespace std;
long long n,m,k,t[2500000],ans;
bool flag=false;
struct node{
	long long a,b;
}arr[250000];
bool cmp(node a,node b){
	return a.b>b.b;
}
int main() {
	cin>>n>>k>>m;
	for(int i=1;i<=n;i++){
		cin>>arr[i].a>>arr[i].b;
	}
	sort(arr+1,arr+n+1,cmp);
	for(int i=1;i<=k;i++){
		if(k-i+1==m){
			flag=true;
		}else{
			if(t[arr[i].a]==0){
				t[arr[i].a]++;
				ans+=arr[i].b;
				m--;
 
			}else{
				ans+=arr[i].b;
			}
		}
		if(flag){
			for(int j=i;j<=k;j++){
				if(t[arr[j].a]==0 && k!=0){
					ans+=arr[j].b;
					t[arr[j].a]++;
				}else{
					k++;
				}
 
			}
			cout<<ans;
			return 0;
		}
	}
	cout<<ans;
	return 0;
}

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NSA1IDEKNCAxMDAwMDAwMDAwCjUgMTAwMDAwMDAwMAo0IDEwMDAwMDAwMDAKNSAxMDAwMDAwMDAwCjQgMTAwMDAwMDAwMAo=

5 5 1
4 1000000000
5 1000000000
4 1000000000
5 1000000000
4 1000000000