x = int(input())

i = 1

while x >= i:
    j = 1 
    
    while x >= j:
        
        if i == 1 or i == x or j == i or j == 1 or j == x:
            print("*", end="")
        else:
            print(" ", end="")
        j += 1
            
        
    
    print("")
    
    i += 1