#include<bits/stdc++.h>
using namespace std;
#define inf INT_MAX
#define INF LLONG_MAX
#define ll long long
#define ull unsigned long long
#define M (int)(1e9+7)
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++)
#define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
#define IN(a,n) rep(i,n){ cin>>a[i]; }
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265
#define F first
#define S second
#define PB push_back
#define EB emplace_back
#define int ll
#define vi vector<int>



signed main(){
  cin.tie(0);
  ios::sync_with_stdio(false);

  int n;
  int a[200100];
  cin>>n;
  rep(i,n){
    cin>>a[i];
  }

  int ans=0;

  rep(i,n){
    int sum=0;
    FOR(j,i,i+24){
      if(j>=n) break;
      sum+=a[j];
    }
    ans=max(ans,sum);
  }

  int q;
  cin>>q;
  while(q--){
    int t,v;
    cin>>t>>v;
    t--;
    a[t]=v;
    FOR(i,t-24,t+24){
      int sum=0;
      FOR(j,i,i+24){
        if(!(0<=j&&j<n)) break;
        sum+=a[j];
      }
      ans=max(ans,sum);
    }
    cout<<ans<<endl;
  }


}