import java.util.Scanner;
public class s{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] g=new int[n];
        int maxprofit=0;
        if(n<=0){
            System.out.println("Invalid input");
            return;
            sc.close();
        }
        else{
            for(int i=0;i<n;i++){
                g[i]=sc.nextInt();
            }
            int minp=g[0];
            for(int i=1;i<n;i++){
                if(minp>g[i]){
                    minp=g[i];
            }
            else{
                int profit=g[i]-minp;
                if(maxprofit<profit){
                maxprofit=profit;
                }
            }
            }
            System.out.println(maxprofit);
        }
        double pp=0.0;
        if(g[0]!=0){
            pp=((double)maxprofit/g[0])*100;
            System.out.printf("%.2f\n",pp);
        }
    }
}