#include <fstream>
using namespace std;

ifstream is("aib.in");
ofstream os("aib.out");


void Update(int poz, int x);
int Query(int poz);
int Search(int a);

int n, m;
int aib[100005];
int val;
int op;

int main()
{
    is >> n >> m;
    for(int i =1; i <= n; ++i)
    {
        is >> val;
        Update(i, val);
    }
    int x, y;
    for(int i = 1; i <= m; ++i)
    {
        is >> op;
        if(op == 0)
        {
            is >> x >> y;
            Update(x, y);
        }
        if(op == 1)
        {
            is >> x >> y;
            os << Query(y) - Query(x-1) << '\n';
        }
        if(op == 2)
        {
            is >> x;
            os << Search(x) << '\n';
        }
    }
    is.close();
    os.close();
    return 0;
}

void Update(int poz, int x)
{
    for(int i = poz; i<= n; i += i & -i)
        aib[i] += x;
    //for(int i = 1; i <= n; ++i)
    //{
    //    os << aib[i] << ' ';
    //}
    //os << '\n';
}

int Query(int poz)
{
    int suma = 0;
    for(int i = poz; i; i -= i & -i)
        suma += aib[i];
    return suma;
}

int Search(int sum)
{
    if(sum == 0) return -1;
    int now = 0;

    for(int i = (1 << 20); i; i >>= 1)
    {
        if(now + i <= n && aib[now + i] <= sum)
        {
            now += i;
            sum -= aib[now];
        }
    }
    if (sum == 0) return now;
    return -1;
}