#include <bits/stdc++.h>
using namespace std;
const double COMPARISION_THRESHOLD = 1e-8;
const std::streamsize PRECISION = 10;
template <typename T>
std::ostream& operator<<(std::ostream& os, const std::vector<T>& vector) {
  for (size_t i = 0; i < vector.size(); ++i) {
    os << vector[i] << " ";
  }
  return os;
}
std::ostream& operator<<(std::ostream& os,
                         const vector<pair<int, int> >& vector) {
  for (size_t i = 0; i < vector.size(); ++i) {
    os << vector[i].first << " " << vector[i].second << "\n";
  }
  os << std::endl;
  return os;
}
vector<double> Input() {
  int size;
  std::cin >> size;
  vector<double> result(size);
  for (int i = 0; i < size; ++i) {
    int x, y;
    cin >> x >> y;
    if (x >= 0) {
      result[i] = atan(double(y) / double(x)) * 180.0 / M_PI;
    } else {
      result[i] = 180.0 + atan(double(y) / double(x)) * 180.0 / M_PI;
    }
  }
  return result;
}
bool equal(double first, double second) {
  return fabs(first - second) < COMPARISION_THRESHOLD;
}
int main() {
  std::ios_base::sync_with_stdio(false);
  vector<double> v = Input();
  sort(v.begin(), v.end());
  if (v.size() == 1) {
    cout << "0\n";
  } else if (v.size() == 2) {
    cout << min(v[1] - v[0], 360.0 - v[1] - v[0]) << endl;
  } else {
    double best = 1E5;
    int i;
    for (i = 0; i + 1 < v.size(); ++i) {
      best = min(best, 360.0 - (v[i + 1] - v[i]));
    }
    best = min(best, v[i] - v[0]);
    if (equal(best, 360)) {
      cout << "0\n";
    } else {
      cout.precision(PRECISION);
      cout << std::fixed << best << endl;
    }
  }
  return 0;
}
