#include <fstream>

using namespace std;
ifstream cin ("aib.in");
ofstream cout ("aib.out");
int n,m,arb[800001],val,poz;
void up_date (int st,int dr,int nod)
{
    if(st==dr && poz==st)
        arb[nod]+=val;
    else
    {
        int mij=(st+dr)/2;
        if(poz<=mij) up_date(st,mij,nod*2);
        else up_date(mij+1,dr,nod*2+1);
        arb[nod]=arb[nod*2]+arb[nod*2+1];
    }
}
int query (int st,int dr,int nod)
{
    if(poz<=st && dr<=val) return arb[nod];
    else
    {
        int mij=(st+dr)/2,r1=0,r2=0;
        if(poz<=mij) r1=query(st,mij,nod*2);
        if(val>mij) r2=query(mij+1,dr,nod*2+1);
        return r1+r2;
    }
}
int query2 (int st,int dr,int nod)
{
    if(st==dr)
    {
        if(poz+arb[nod]==val) return st; else return -1;
    }
    else
    {
        int mij=(st+dr)/2;
        if(poz+arb[nod*2]>=val) return query2(st,mij,nod*2);
        else {poz=poz+arb[nod*2]; return query2(mij+1,dr,nod*2+1);}
    }
}
void read ()
{
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        cin>>val; poz=i;
        up_date(1,n,1);
    }
}
void solve ()
{
    int p;
    for(int i=1;i<=m;i++)
    {
        cin>>p;
        if(p!=2) cin>>poz>>val; else cin>>val,poz=0;
        if(p==0) up_date(1,n,1);
        else if(p==1) cout<<query(1,n,1)<<"\n";
        else if(p==2) cout<<query2(1,n,1)<<"\n";
    }
}
int main()
{
    read();
    solve();
    cin.close();
    cout.close();
    return 0;
}