Jaav 8 solution

    int maxRepeat = 0;

        for(int i = 0; i < arr.size(); i++){
            int num = arr.get(i);
            int RepeatNum = 0;

            for(int j = 0; j < arr.size(); j++){
                if(arr.get(j) == num){
                    RepeatNum++;
                }
            }
            if(maxRepeat < RepeatNum){
                maxRepeat = RepeatNum;
            }
        }
        return arr.size() - maxRepeat;