This works in Python3

n = int(input()) s = set(map(int, input().split())) N = int(input())

for _ in range(N): command = input().split()

if command[0] == 'pop':
    s.pop()
elif command[0] == 'discard':
    s.discard(int(command[1]))
else:
    s.remove(int(command[1]))

print(sum(s))