importsysdefsolution(s1,s2,s3,s4):# s[0]: 내린 사람 수, s[1]: 탄 사람 수
max_people=-sys.maxsize-1# 1번
people=s1[1]# 2번
people-=s2[0]people+=s2[1]max_people=max(max_people,people)# 3번
people-=s3[0]people+=s3[1]max_people=max(max_people,people)# 4번 (의미 없는 연산)
people-=s4[0]returnmax_peoples1=list(map(int,input().split()))s2=list(map(int,input().split()))s3=list(map(int,input().split()))s4=list(map(int,input().split()))print(solution(s1,s2,s3,s4))
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