#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  long long n, k;
  cin >> n >> k;
  vector<long long> ans(n);
  set<pair<long long, long long>> demid;
  for (int i = 0; i < k; i++) {
    long long s, m;
    cin >> s >> m;
    demid.insert({s + m, i});
  }
  for (int i = 0; i < n - k; i++) {
    long long s, m;
    pair<long long, long long> now;
    cin >> s >> m;
    now = *demid.begin();
    demid.erase(demid.begin());
    ans[now.second] = now.first;
    demid.insert({max(s, now.first) + m, i + k});
  }
  while (demid.size()) {
    pair<long long, long long> now;
    now = *demid.begin();
    demid.erase(demid.begin());
    ans[now.second] = now.first;
  }
  for (int i = 0; i < n; i++) {
    cout << ans[i] << endl;
  }
  return 0;
}
