import sys
rr = sys.stdin
N = int(rr.readline())
A = list(map(int,rr.readline().split()))
Q = int(rr.readline())
def calc(i):
    ans = 0
    for j in range(max(0,i - 24 + 1),i + 1):
        if j + 23 >= N:
            break
        tmp = 0
        for k in range(24):
            tmp += A[j + k]
        if tmp > ans:
            ans = tmp
    return ans
ans = 0
for i in range(N):
    tmp = calc(i)
    if tmp > ans:
        ans = tmp
for _ in range(Q):
    t,v = map(int,rr.readline().split())
    A[t - 1] = v
    tmp = calc(t - 1)
    if tmp > ans:
        ans = tmp
    print(ans)