def repeatedString(s:str, n:int):
    # Number of letter A in s
    n_of_a = s.count("a")

    #Lenght of s
    n_of_letters = len(s)

    # number of s based on n , rest of s if exist 
    number_of_substring , rest_of_substring = divmod(n,n_of_letters)
    
    # number of letter A in the rest of s
    rest = s[0:rest_of_substring].count("a")
    
    # so every substring there exist number of A Letter + rest if exist  
    result = (number_of_substring * n_of_a)  +  rest

    return result