#include<stdio.h>
#include<stdlib.h>

typedef struct node{
    int data;
    struct node*next;
}Node;

Node *head=NULL,*tail;

void create(int num){
    Node*newNode=(Node*)malloc(1* sizeof(newNode));
    newNode->data=num;
    newNode->next=NULL;
    
    if(head==NULL){
        head = newNode;
        tail = newnode;
    }
    else{
        tail->next=newNode;
        tail = newNode;
    }
}
void display(int itr){
    for(itr=head;itr!=NULL;itr=itr->next){
        printf("%d",itr->data);
    }
}

int main(){
    int N,num,itr;
    scanf("%d",&N);
    
    for(int itr=1;itr<N;itr++){
        scanf("%d",&num);
        create(num);
    }
    display();
    return 0;
}