hacker rank python (collections.Counter())solution

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31.collections.Counter()

#counter just devvide list in keys and values
from collections import Counter
x=int(input())
sum=0
l=[]
shoes = Counter(map(int, raw_input().split()))
n=int(input())
for j in range(n):
sn ,sp = map(int, raw_input().split())
if(shoes[sn]>0):
sum = sum+sp
shoes[sn] -= 1
print(sum)

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