class Queue:
    def __init__(self):
        self.__elems = []
        self.__queuestart = 0


    def enq(self, data):
        self.__elems.append(data)


    def deq(self):
        self.__queuestart += 1
        return self.__elems[self.__queuestart - 1]


    def print(self):
            print(self.__elems)


    def len(self):
            print(len(self.__elems))


que = Queue()
client = []

count = int(input())
for i in range(count):
    client = list(map(int, input().split()))
    client_time = client[0]
    client_temp = client[1]
    if que.len() == 0:
        print(client_time + 20)
        que.enq(client_time + 20)
    else:
        actual_time = que.deq()
        if client_time + 20 * client_temp < actual_time:
            print(client_time)
        elif client_time > actual_time:
            print(client_time + 20)
            que.enq(client_time + 20)
        else:
            print(actual_time + 20)
            que.enq(actual_time + 20)