#include <bits/stdc++.h>   using namespace std;   double getangle(pair<int, int> a, pair<int, int> b) {}   int main() {     int n;     cin >> n;     double arr[n + 1];     for (int i = 0; i < n; ++i) {       int x, y;       cin >> x >> y;       arr[i] = atan2(x, y);       if (arr[i] < 0) arr[i] += 2.0 * M_PI;       arr[i] *= 180.0 / M_PI;     }     sort(arr, arr + n);     double a = 0.0;     if (n <= 2)       a = min(360.0 - (arr[0] - arr[n - 1] + 360.0),               360.0 - (arr[n - 1] - arr[0]));     else {       a = 360.0 - (arr[0] - arr[n - 1] + 360.0);       for (int i = 0; i < n - 1; ++i) a = min(a, 360.0 - (arr[i + 1] - arr[i]));     }     printf( %.8lf n , a);   }   