def luckBalance(k, contests):
    all_l = 0
    ls_ls = []
    for row in contests:
        if row[1] == 0:
            all_l += row[0]
        elif row[1] == 1:
            ls_ls.append(row[0])
    
    ls_ls = sorted(ls_ls, reverse=True)
    all_l = all_l + sum(ls_ls[:k]) - sum(ls_ls[k:])
    return all_l