#include <iostream>
#include <fstream>
#define MAXN 100001
#define zeros(x) ((x ^ (x-1)) & x)
using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int n,m,aib[MAXN],x,a,b,c;
void update (int cur,int val)
{
    //aib[cur]=val;
    for (int x=cur; x<=n; x+=zeros(x))
    {
        aib[x]+=val;
    }
}
int sum1a (int a)
{
    int sum=0;
    for (int i=a; i>=1; i-=zeros(i))
    {
        //cout<<i<<' '<<zeros(i)<<'\n';
        sum+=aib[i];
    }
    return sum;
}
int query (int k)
{
    int li=1,ls=n,lm,save=MAXN;
    while (li<=ls)
    {
        lm=(li+ls)/2;
        if (sum1a(lm)<=k)
        {
            save=lm;
            li=lm+1;
        }
        else
        {
            ls=lm-1;
        }
    }
    return save;
}
/*int query (int a,int b)
{
    int sum=0;
    for (a; a<=b; a+=zeros(x))
    {
        sum+=aib[a];
    }
    return sum;
}
int task3query (int k)
{
    int sum=0,save=0;
    for (int i=1; i<=n && sum<k; i+=zeros(i))
    {
        save=i;
        sum+=aib[i];
        //cout<<i<<'\n';
    }

    return save;
}*/
int main()
{
    f>>n>>m;
    for (int i=1; i<=n; i++)
    {
        f>>x;
        update(i,x);
    }
    for (int i=1; i<=m; i++)
    {
        f>>a>>b;
        if (a==0)
        {
            f>>c;
            update(b,c);
        }
        else if (a==1)
        {
            f>>c;
           // cout<<sum1a(c)<<'\n';
            //cout<<'\n';
            g<<sum1a(c)-sum1a(b-1)<<'\n';
        }
        else
        {
            g<<query(b)<<'\n';
        }
    }
    return 0;
}