#include <bits/stdc++.h>
#define ub(x) (x&(-x))
using namespace std;
ifstream f ("aib.in");
ofstream g ("aib.out");
int n,m,aib[100002],st,dr,i,x,cer,a,b,poz,mij;
void update (int poz, int val)
{
    for (int i = poz; i <= n; i += ub(i))
        aib[i] += val;
}
int suma (int poz)
{
    int S = 0;
    for (int i = poz; i > 0; i -= ub(i))
        S = S + aib[i];
    return S;
}
int main()
{
    f >> n >> m;
    for (i = 1; i <= n; i++)
    {
        f >> x;
        update(i,x);
    }
    for (i = 1; i <= m; i++)
    {
        f >> cer;
        if (cer == 0)
        {
            f >> a >> b;
            update(a,b);
        }
        else if (cer == 1)
        {
            f >> a >> b;
            g << suma(b) - suma(a-1) << '\n';
        }
        else
        {
            f >> a;
            st = 1;
            dr = n;
            poz = -1;
            while (st <= dr && poz == -1)
            {
                mij = (st + dr) / 2;
                if (suma(mij) > a)
                {
                    dr = mij - 1;
                }
                else if (suma(mij) < a)
                {
                    st = mij + 1;
                }
                else
                {
                    poz = mij;
                    break;
                }
            }
            g << poz << '\n';
        }
    }
    return 0;
}