#include <fstream>

using namespace std;

ifstream cin("aib.in");
ofstream cout("aib.out");

int n, m, aib[100005];

void update(int i, int x)
{
    while (i <= n)
    {
        aib[i] += x;
        i += i & -i;
    }
}

int sp(int i)
{
    int r = 0;
    while (i > 0)
    {
        r += aib[i];
        i -= i & -i;
    }
    return r;
}

int main()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        int x;
        cin >> x;
        update(i, x);
    }
    for (int i = 0; i < m; i++)
    {
        int c, a, b;
        cin >> c;
        if (c == 0)
        {
            cin >> a >> b;
            update(a, b);
        }
        else if (c == 1)
        {
            cin >> a >> b;
            cout << sp(b) - sp(a-1) << "\n";
        }
        else if (c == 2)
        {
            cin >> a;
            int st = 1, dr = n;
            while (st < dr)
            {
                int mij = (st + dr)/2;
                if (sp(mij) < a)
                {
                    st = mij+1;
                }
                else if (sp(mij) > a)
                {
                    dr = mij-1;
                }
                else
                {
                    dr = mij;
                }
            }
            if (sp(st) != a)
            {
                cout << -1 << "\n";
            }
            else
            {
                cout << st << "\n";
            }
        }
    }
    return 0;
}