int count = 0, p_r_p_c = 1; //p_r_p_c = page required per chapter
    for(int i = 0; i< arr.size();i++){
        int n = 1;
        while(n <= arr[i]){
            if(n == p_r_p_c) count++;
            
            if(n%k == 0 && n != arr[i]) p_r_p_c++;
            
            n++;
        }
        p_r_p_c++;
    }
    return count;