#include <bits/stdc++.h>
using namespace std;
int main() {
  int i, j, m, n, k, a[1100], b[1100][10], count = 0;
  cin >> n >> m >> k;
  for (i = 0; i <= m; i++) a[i] = 10000000;
  for (i = 1; i <= n; i++) {
    for (j = 0; j < 2; j++) cin >> b[i][j];
    if (a[b[i][0]] > b[i][1]) a[b[i][0]] = b[i][1];
  }
  for (i = 1; i <= m; i++) count += a[i];
  if (count > k)
    cout << k << endl;
  else
    cout << count << endl;
  return 0;
}
