#include <fstream>

using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int n,m,aib[15005],c,a,b,x;
void update(int x,int p)
{
    int i;
    for (i=p;i<=n;i+=(i&(-i)))
        aib[i]+=x;
}
int suma(int p)
{
    int i,s=0;
    for (i=p;i>0;i-=(i&(-i)))
        s+=aib[i];
    return s;
}
int cautare(int k)
{
    int st=1,dr=n,mijl;
    while (st<=dr)
    {
        mijl=(st+dr)/2;
        if (suma(mijl)==k) return mijl;
        else if (suma(mijl)<k) st=mijl+1;
             else dr=mijl-1;
    }
    return -1;
}
int main()
{
    int i;
    f>>n>>m;
    for (i=1;i<=n;i++)
    {
        f>>x;
        update(x,i);
    }
    for (i=1;i<=m;i++)
    {
        f>>c;
        if (c==0) {f>>a>>b;update(b,a);}
        else if (c==1) {
                f>>a>>b;
        g<<suma(b)-suma(a-1)<<'\n';
        }
        else {
            f>>a;
        g<<cautare(a)<<'\n';
        }
    }
    return 0;
}