#include <fstream>

using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int ub(int x)
{
    return (x&(x-1))^x;
}
int x,aib[100000],n,m;
void upgrade(int poz,int val)
{
    int i;
    for (i=poz;i<=n;i+=ub(i))
    {
        aib[i]+=val;
    }
}
int Suma(int x)
{
    int i,S=0;
    for (i=x;i>0;i-=ub(i))
    {
        S+=aib[i];
    }
    return S;
}
int in,y,nr,mij;
int main()
{
    int i;
    f>>n>>m;
    for (i=1;i<=n;i++)
    {
        f>>x;
        upgrade(i,x);
    }
    for (i=1;i<=m;i++)
    {
        f>>in;
        if (in==1)
        {
            f>>x>>y;
            g<<Suma(y)-Suma(x-1)<<'\n';
        }
        else
        if (in==0)
        {
            f>>x>>y;
            upgrade(x,y);
        }
        else
        {
            f>>nr;
            int st=1;
            int dr=n;
            int poz=0;
            while (st<=dr&&!poz)
            {
                mij=(st+dr)/2;
                if (Suma(mij)==nr)
                {
                    poz=mij;
                    break;
                }
                else
                if (Suma(mij)<nr)
                {
                    st=mij+1;
                }
                else
                {
                    dr=mij-1;
                }
            }
            if (poz!=0)
            {
                g<<poz<<'\n';
            }
            else
            {
                g<<"-1"<<'\n';
            }
        }
    }
    return 0;
}