repeatedString.py

def repeatedString(s, n):
    number = s.count('a')
    if number == 0:
        return 0
    if number == 1 and len(s) == 1:
        return n
    repeats = n//len(s)
    remainder = math.floor(n%len(s))
    return number*repeats+s[:remainder].count('a')