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