백준 2109 파이썬 순회공연

import sys
import heapq
input = sys.stdin.readline
n = int(input())
li = [list(map(int,input().split())) for _ in range(n)]
li.sort(key=lambda x:x[1])
temp = []

for p,d in li:
    heapq.heappush(temp,p)
    if len(temp) > d:
        heapq.heappop(temp)
print(sum(temp))