#include <bits/stdc++.h>

using namespace std;
using Point = complex<double>;

Point perp(Point p) { return {-p.imag(), p.real()}; }

int main() {
  ifstream cin("expand.in");
  ofstream cout("expand.out");

  int _t, n; double r;
  cin >> _t >> n >> r; r += 1e-7;
  vector<Point> pts;
  for (int i = 0; i < n; ++i) {
    double x, y; cin >> x >> y;
    pts.emplace_back(x, y);
  }

  vector<Point> sol = pts;
  for (int it = 0; it < 300; ++it) {
    int idx = it % n;
    Point a = sol[(idx + n - 1) % n], b = sol[(idx + 1) % n];
    Point ref = pts[idx];
    Point d = perp(b - a);
    sol[idx] = ref - d / abs(d) * r;
  }

  cout << fixed << setprecision(20);
  for (int i = 0; i < n; ++i)
    cout << sol[i].real() << " " << sol[i].imag() << '\n';

  return 0;
}