#include<stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    for ( int i=0;i<=-10;i--){
        
       for(int j=i;j<=10;j++){
      
      printf("invalid input");
       }
       for (int k=i;k<n-1;k++){
           printf("");
       }
       return 0;
    }
}