#include <fstream>
using namespace std;
ifstream cin("aib.in");
ofstream cout("aib.out");

#define nmax 100010

int n,m,a[nmax],t,x,y;

void update(int poz,int val)
{
    int c=0;
    while (poz<=n)
    {
        while (!((1<<c)&poz))
            c++;
        a[poz]+=val;
        poz+=1<<c;
        c++;
    }
}

int query(int poz)
{
    int c=0,s=0;
    while (poz>0)
    {
        while (!((1<<c)&poz))
            c++;
        s+=a[poz];
        poz-=1<<c;
        c++;
    }
    return s;
}

int suma(int val)
{
    int put2=1,i;
    for (;put2<n;put2<<=1);
    for (i=0;put2;put2>>=1)
    {
        if (i+put2<=n)
        if (val>=a[i+put2])
        {
            i+=put2;
            val-=a[i];
            if (!val) return i;
        }
    }
    return -1;
}

int main()
{
    int i,j;
    cin>>n>>m;
    for (i=1;i<=n;i++)
    {
        cin>>x;
        update(i,x);
    }
    for (i=1;i<=m;i++)
    {
        cin>>t;
        if (t==0)
        {
            cin>>x>>y;
            update(x,y);
        }
        else if (t==1)
        {
            cin>>x>>y;
            cout<<query(y)-query(x-1)<<'\n';
        }
        else
        {
            cin>>x;
            cout<<suma(x)<<'\n';
        }
    }
}