n = int(stdin.readline())
tasks = []
total_waiting_time = 0
totalTime = 0
cookingPriority = MinHeap()
for _ in range(n):
A, C = map(int, stdin.readline().strip().split(" "))
tasks.append((A, C))
tasks.sort()
index = 0
while tasks or cookingPriority.currentSize > 0:
while tasks and tasks[index][0] <= totalTime:
cookingPriority.insert_element(tasks.pop(0)[::-1])
if cookingPriority.currentSize > 0:
current_task = cookingPriority.peek()
totalTime += current_task[0]
waitingTime = totalTime - current_task[1]
total_waiting_time += waitingTime
cookingPriority.delete_min()
else:
cookingPriority.insert_element(tasks.pop(0)[::-1])
current_task = cookingPriority.peek()
totalTime = current_task[1]
print(total_waiting_time // n)
from sys import stdin
from BinaryHeap import MinHeap
t = int(stdin.readline())
heap = MinHeap()
for _ in range(t):
inp = list(map(int, stdin.readline().strip().split(" ")))
operation = inp[0]
element = inp[1] if len(inp) == 2 else 0
if operation == 1:
heap.insert_element(element)
elif operation == 2:
heap.delete_element(element)
elif operation == 3:
print(heap.peek())