// <DATETIME>
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pii pair<int, int>
#define fi first
#define se second
#define rep(i, x, y) for (int i = (x); i <= (y); i ++ )
#define per(i, x, y) for (int i = (x); i >= (y); i -- )
const int N = 5e5 + 5, M = 1e6 + 5;
const int inf = 1e9, mod = 998244353;
const ll INF = 1e18, RMX = 2324814;
mt19937 rd(time(0));
uniform_int_distribution<int> dist(0, RMX);

int n, a[N], q;

signed main(){
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    
    cin >> n;
    rep(i, 1, n) cin >> a[i];
    
    ll mx = 0;
    rep(i, 24, n){
		ll sum = 0;
		rep(j, i - 23, i) sum += a[j];
		mx = max(mx, sum);
	}
    
    cin >> q;
    while (q -- ){
		int pos, x; cin >> pos >> x;
		a[pos] = x;
		
		rep(i, max(pos, 24), min(pos + 23, n)){
			ll sum = 0;
			rep(j, i - 23, i) sum += a[j];
			mx = max(mx, sum);
		}
		cout << mx << "\n";
	}
}