// editor2
#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *next;
    struct node *prev;
}node;
node *tail,*head=NULL;

void create(int num)
{
    node *newnode = (node *)malloc(sizeof(node));
    newnode->data=num;
    newnode->next=NULL;
    newnode->prev=NULL;
    
    if(head==NULL)
    {
        head=newnode;
        tail=newnode;
    }
    else
    {
        newnode->prev = tail;
        tail->next=newnode;
        tail=newnode;
    }
}

void display()
{
    node  *max=head->data;
    node *tem=head->next;
    
    while(tem!=NULL)
    {
        if((tem->data)>max)
        {
            max=tem->data;
        }
        tem=tem->next;
    }
    printf("%d",temp->data);
}

int main()
{
    int size,num;
    scanf("%d",&size);
    if(size<=0)
    {
        printf("Invalid input");
        return 0;
    }
    for(int i=0;i<size;i++)
    {
        scanf("%d",&num);
        if(num<=0)
        {
            printf("Invalid input");
            return 0;
        }
            create(num);
    }

    display();
    return 0;
}