#include <bits/stdc++.h>
using namespace std;
double PI = 2 * acos(0);
std::vector<int> vi;
int main(int argc, char const *argv[]) {
  double n;
  cin >> n;
  if (n < 5) {
    cout << "No solution" << endl;
    return 0;
  }
  double l = 604, x = 0, y = 0, t = 2 * PI / n, T = t;
  cout << setprecision(18);
  for (int i = 1; i < n; i++) {
    cout << x << " " << y << endl;
    if (i == n - 1) {
      break;
    }
    x += cos(t) * l;
    y += sin(t) * l;
    l += 0.01;
    t += T;
  }
  cout << double(x - y / tan(t)) << " 0" << endl;
  return 0;
}
