# coding:UTF-8
import sys

MOD = 10 ** 9 + 7
INF = float('inf')

N = int(input())    # 数字
A = list(map(int, input().split()))     # スペース区切り連続数字
Q = int(input())    # 数字
TV = [list(map(int, input().split())) for _ in range(Q)]     # スペース区切り連続数字(行列)

res = sum(A[0:24])
Asum = [0] * (N-23)
Asum[0] = res
for i in range(1, N-23):
    Asum[i] = Asum[i-1] - A[i-1] + A[i+23]
    res = max(res, Asum[i])

for j in range(Q):
    t = TV[j][0] - 1
    v = TV[j][1]
    dif = v - A[t]
    A[t] = v
    ts = max(t - 23, 0)
    te = min(t, N - 24)
    for i in range(ts, te+1):
        Asum[i] += dif
        res = max(res, Asum[i])

    print("{}".format(res))