#include <fstream>
#define MAX 100000
using namespace std;
ifstream cin ("aib.in");
ofstream cout ("aib.out");
int aib[MAX + 10], n;
int lsb(int x)
{
    return (x & (-x));
}
void update(int pos, int val)
{
    for (int i = pos; i <= n; i = i + lsb(i))
        aib[i] = aib[i] + val;
}
int query(int pos)
{
    int sum = 0;
    for (int i = pos; i >= 1; i = i - lsb(i))
        sum = sum + aib[i];
    return sum;
}
int main()
{
    int q;
    cin >> n >> q;
    for (int i = 1; i <= n; i++)
    {
        int x;
        cin >> x;
        update(i, x);
    }
    for (int i = 1; i <= q; i++)
    {
        int type;
        cin >> type;
        if (type == 0)
        {
            int pos, val;
            cin >> pos >> val;
            update(pos, val);
        }
        if (type == 1)
        {
            int x, y;
            cin >> x >> y;
            cout << query(y) - query(x - 1) << '\n';
        }
        if (type == 2)
        {
            int x;
            cin >> x;
            int sum = 0, pos = 0, step = (1 << 17), ans = -1;
            while (step != 0 && ans == -1)
            {
                if (pos + step <= n && sum + aib[pos + step] <= x)
                {
                    sum = sum + aib[pos + step];
                    pos = pos + step;
                    if (sum == x)
                        ans = pos;
                }
                step = step / 2;
            }
            cout << ans << '\n';
        }
    }
    return 0;
}