import sys
input = sys.stdin.readline
N = int(input())
lsA = list(map(int,input().split()))
Q = int(input())
lsTV = []
for i in range(Q):
    t,v = map(int,input().split())
    lsTV.append((t-1,v))
maxp = 0
for i in range(N-23):
    maxp = max(maxp,sum(lsA[i:i+24]))

for i in range(Q):
    t,v = lsTV[i]
    l,r = max(0,t-24),t+24
    lsA[t] = v
    for j in range(l,r):
        sm = sum(lsA[j:j+24])
        if maxp < sm:
            maxp = sm
    print(maxp)