import java.util.*;
class rec
{
    int max=0;
    int maxx(int i,int arr[])
    {
        if(i==-1)
         return max;
        else
        {
            if(arr[i]>max)
               max=arr[i];
        }
        return maxx(--i,arr);
        
    }
    public static void main(String[] args)
    {
        rec c=new rec();
        try
        {
            Scanner sc=new Scanner(System.in);
            int n=sc.nextInt();
            if(n<0)
              System.out.println("Invalid input");
            else
            {
               int arr[]=new int[n];
               for(int i=0;i<n;i++)
                 arr[i]=sc.nextInt(); 
               System.out.println(c.minn(n-1,arr));
            }
        }
        catch(Exception e)
        {
            System.out.println("Invalid input");
        }
        
           
    }
}