/*
 * author:  ADMathNoob
 * created: 05/07/24 20:25:05
 * problem: https://qoj.ac/problem/2301#tab-statement
 */

/*
Comments about problem:


*/

#include <bits/stdc++.h>

using namespace std;

#ifdef _DEBUG
#include "debug.h"
#else
#define debug(...) 42
#endif

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> y(n), x(n);
  for (int i = 0; i < n; i++) {
    cin >> y[i] >> x[i];
  }
  const int D = 720;
  vector<bool> was(D);
  for (int i = 0; i < n; i++) {
    int j = (i + 1) % n;
    int y1 = x[i];
    int y2 = x[j];
    if (abs(y1 - y2) == 180) {
      cout << "yes\n";
      return 0;
    }
    if (y2 < y1) {
      y2 += 360;
    }
    if (y2 - y1 < 180) {
      for (int z = 2 * y1; z <= 2 * y2; z++) {
        was[(z % D + D) % D] = true;
      }
    } else {
      y1 += 360;
      for (int z = 2 * y2; z <= 2 * y1; z++) {
        was[(z % D + D) % D] = true;
      }
    }
  }
  if (count(was.begin(), was.end(), true) == D) {
    cout << "yes\n";
  } else {
    cout << "no ";
    for (int i = 0; i < D; i++) {
      if (!was[i]) {
        double d = 0.5 * i;
        if (d >= 180) {
          d -= 360;
        }
        cout.precision(1);
        cout << fixed << d << '\n';
        return 0;
      }
    }
  }
  return 0;
}