def concati(s, i):
    """
    Return a string that is s concatenated to itself i times.
    If i<1, the result is a null string.
    If i is a large value, may the lord have mercy on your soul.
    """

    result=""
    for j in range(1, i+1):
        result=result + s

    return result

n=5

for i in range(1, n+1):
    print concati("*", i)