#include <iostream>
#include <vector>
#include <utility>
#include <iomanip>
using namespace std;
int main() {
  typedef pair<double,double> Hist;
  vector<Hist> diffSpectrum;
  double E, h;
  while (cin >> E >> h) {
    diffSpectrum.push_back(Hist(E,h));
  }
  vector<Hist> intSpectrum(diffSpectrum.size());
  for (size_t i = 0; i < diffSpectrum.size(); ++i) {
    intSpectrum[i].first = diffSpectrum[i].first;
    for (size_t j = i; j < diffSpectrum.size(); ++j) {
      intSpectrum[i].second += diffSpectrum[j].second;
    }
  }
  cout << fixed << setprecision(10);
  for (size_t i = 0; i < intSpectrum.size(); ++i) {
    cout << intSpectrum[i].first << ' ' << intSpectrum[i].second << endl;
  }
}