N=int(input())
A=list(map(int,input().split()))
Q=int(input())
Query=[list(map(int,input().split())) for i in range(Q)]

S=sum(A[:24])
MAX=S
for i in range(24,N):
    S+=A[i]-A[i-24]
    MAX=max(MAX,S)

def MAX_from_i(q):
    from_q=max(q,24)
    S=sum(A[from_q-24:from_q])
    MAX=S
    for i in range(from_q,min(q+25,N)):
        S+=A[i]-A[i-24]
        MAX=max(MAX,S)

    return MAX

for t,v in Query:
    A[t-1]=v
    MAX=max(MAX,MAX_from_i(t-1))

    print(MAX)