#include<stdio.h>
#include<stdlib.h>
typedef struct circle{
    int data;
    struct circle*next;
    
}odd;
typedef struct circle1{
    int data;
    struct circle*next;
}even;
odd*head=NULL,*tail=NULL;
void odd(int num){
    odd*newNode=(odd*)malloc(1*sizeof(odd));
    newNode->data=num;
    newNode->next=NULL;
    if(head==NULL){
        head=newNode;
        tail=newNode;
    }
    else{
        tail->next=newNode;
        tail=Newnode;
    }
    tail->next=head;
}
void evenn(int num){
    even*newNode=(even*)malloc(1*sizeof(even));
    newNode->data=num;
    newNode->next=NULL;
    if(head==NULL){
        head=newNode;
        tail=newNode;
    }
    else{
        tail->next=newNode;
        tail=Newnode;
    }
    tail->next=head;
}
void display(){
    odd*temp=head;
    even*temp2=head2;
    do{
        printf("%d",temp2->data);
        temp2=temp2->next;
    }while(temp2!=head);
}
int main(){
    int n,data;
    scanf("%d",&n);
    if(n<=0){
        printf("Invalid input");
        return 0;
    }
    if(data%2==0){
        evenn(data);
    }
    else{
        oddn(data);
    }
    display();
    return 0;
}