import java.util.Scanner;
public class abc{
    int st=0;
    int max=0;
    int greatest(int len,int[] arr){
        if(arr[st]>max){
            max = arr[st];
        }st++;
        if(st==len){
            return max;
        }
        return greatest(len,arr);
    }
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        if(!hasNextInt()){
            System.out.print("Invalid input");
            System.exit(0);
        }
        if(num<0){
            System.out.print("Invalid input");
            System.exit(0);
        }
        int[] arr =new int[num];
        for(int i=0;i<num;i++){
            arr[i]=sc.nextInt();
        }
        abc aa = new abc();
        int ans = aa.greatest(num,arr);
        System.out.print(ans);
    }
}