#include<stdio.h>
#include<stdlib.h>
typedef struct Node{
    int data;
    struct Node *next;
}Node;
int main(){
    int n,x;
    if(scanf("%d",&n) !=1 || n <= 0){
        printf("Invalid input\n");
        return 0;
    }
    Node *head=NULL, *tail = NULL, *p;
    for (int i = 0; i < n; i++){
        printf("Invalid input\n");
        return 0;
    }
    p = malloc(sizeof(Node));
    p->data = x; p->next = NULL;
    if(!head) head = tail = p;
    else { tail->next = p; tail = p;}
    for (p = head;p = p->next) printf("%d",p->data);
    printf("\n");
    return 0;
}