public static long repeatedString(String s, long n) {
        long fullRpt = n / s.length();
        
        int perStringA = 0;
        
        for (char c : s.toCharArray()) {
            if (c == 'a') perStringA++;
        }
        
        int remA = 0;
        
        int rem = (int) (n % s.length());
        
        for (int i = 0; i < rem; i++) {
            if (s.charAt(i) == 'a') remA++;
        }
        
        return perStringA*fullRpt + remA;
    }