import java.util.*; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); while(in.hasNext()) { int n = in.nextInt(); float[] nums = new float[n]; for(int i = 0;i<n;i++) nums[i] = in.nextFloat(); float res = 0; TreeSet<Float> set = new TreeSet<>(); set.add(nums[0]); for(int i = 1;i<n;i++) { float temp = nums[i] - 180; res = Math.max(res, nums[i] - set.ceiling(temp)); set.add(nums[i]); } System.out.println((float)Math.round(res*10)/10); } } }