#include<stdio.h>
int main(){
    int size, i,j;
    scanf("%d", &size)
    if(size<=0) ||size %2==0){
        printf("Invalid input");
        return 0;
    }
   int mid = size/2;
   for(i=0; i<size; i++){
       for (j=0;j<size; j++){
           if (i==mid||j==mid)
            printf("*");
        else
         printf(" ");
       }
       printf("\n");
   }
     return 0;
}