#include <fstream>
#define ub(x) (x&(-x))
using namespace std;

ifstream f ("aib.in");
ofstream g ("aib.out");

int n, m, cer, x, a, b, st, dr, mij, poz;

int aib[100004];

void update (int poz, int val)
{
    for (int i = poz; i <= n; i += ub(i))
    {
        aib[i] += val;
    }
}

int Sum (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 (int i = 1; i <= n; i++)
    {
        f >> x;
        update(i,x);
    }

    for (int i = 1; i <= m; i++)
    {
        f >> cer;

        if (cer == 0)
        {
            f >> a >> b;
            update(a,b);
        }
        else if (cer == 1)
        {
            f >> a >> b;
            g << Sum(b) - Sum(a-1) << '\n';
        }
        else
        {
            f >> a;
            st = 1;
            dr = n;
            poz = -1;
            while (st <= dr)
            {
                mij = (st + dr) / 2;
                if (Sum(mij) < a) st = mij + 1;
                else if (Sum(mij) > a) dr = mij - 1;
                else
                {
                    poz = mij;
                    dr = mij - 1;
                }
            }

            g << poz << '\n';
        }
    }
    return 0;
}