#include "UWEvent.hh"
#include <iostream>

using namespace std;
using namespace fastjet;

int main() {
  vector<PseudoJet> event;
  int iev = 0;

  while (readUWEvent(cin, event) && ++iev <= 5) {
    cout << "Event " << iev << ", size = " << event.size() << endl;
  }
}