#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;



int main()
{
	int n, m, k, p[110] = { 0 }, ans = 0;
	cin >> n >> m >> k;
	for (int i = 1; i <= m; i++)
	{
		p[i] = 99999;
	}
	for (int i = 1; i <= n; i++)
	{
		int x, c;
		cin >> x >> c;
		p[x] = min(p[x], c);
	}
	for (int i = 1; i <= m; i++) 
	{
		ans += p[i];
	}
	cout<<min(ans,k);


	return 0;
}