// editor3
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *right;
    struct node *left;
}Node;

Node *root =NULL;

Node *maximum(Node *root)
{
    if(root==NULL){
        return root;
    }if(root->right !=NULL){
        return maximum(root->right);
    }return root;
}
Node *create(int num){
    Node *newNode=(Node*)malloc(1* sizeof(Node));
    newNode->data=num;
    newNode->left=NULL;
    newNode->right=NULL;
    return newNode;
}

Node *insert(Node *root,int num){
    if(root == NULL){
        return create(num);
    }else if(num<root->data){
        root->left=insert(root->left,num);
    }else if(num>root->data){
         root->right=insert(root->right,num);
    }
    return root;
}

int main(){
    int size,itr,num;
    scanf("%d",&size);
    if(size<=0){
        printf("Invalid input");
        return 0;
    }
    for(i=0;i<size;i++){
        scanf("%d",&num);
        root=insert(root,num);
    }
    
    
    
    
    Node *ans=maximum(Node root);
    printf("%d",ans->data);
    return 0;
}