#include <fstream>

using namespace std;

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

int n, m;
int arb[100005];

void citire();
void adauga (int poz, int x);
int suma (int poz);
int caut (int x);

int main ()
{
    citire();
    return 0;
}

void citire ()
{
    int x, i, a, b, tip;
    f >> n >> m;
    for (i=1; i<=n; i++)
    {
        f >> x;
        adauga (i,x);
    }
    while (m > 0)
    {
        f >> tip;
        if (tip < 2)
        {
            f >> a >> b;
            if (tip == 0)
                adauga(a, b);
            else
                g << suma(b) - suma(a-1) << '\n';
        }
        else
        {
            f >> a;
            g << caut(a) << '\n';
        }
        m--;
    }
}

void adauga (int poz, int x)
{
    while (poz <= n)
    {
        arb[poz] += x;
        poz += (poz ^ (poz-1)) & poz;
    }
}

int suma (int poz)
{
    int s = 0;
    while (poz > 0)
    {
        s += arb[poz];
        poz -= (poz ^ (poz-1)) & poz;
    }
    return s;
}

int caut (int x)
{
    int k = 1, i;
    while (k < n)
        k *= 2;
    i = 0;
    while (k > 0)
    {
        if (i + k <= n){
            if (suma(i+k) == x)
                return i+k;
            else if (suma(i+k) < x)
                i += k;
        }
        k /= 2;
    }
    return -1;
}