#include<stdio.h>
#include<stdlib.h>
struct Node{
    int data;
    struct Node*next;
};
struct Node*insertNode(struct Node*head,int value){
    struct Node*newNode=(struct Node*)malloc(sizeof(struct Node));
    newNode->data=value;
    newNode->next=NULL;
    if(head==NULL){
        return newNode;
    }
    struct Node*temp=head;
    while(temp->next!=NULL){
        temp=temp->next;
    }
    temp->next=newNode;
    return head;
}
void traverseList(struct Node*head){
    struct Node*trm=head;
    while(temp!=NULL){
        printf("%d",temp->data);
        temp=temp->next;
    }
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid Input");
        return 0;
    }