#include <fstream>

using namespace std;

ifstream fin("aib.in");
ofstream fout("aib.out");

#define lsb(x) (x&(-x))

static const int NMAX=1e5+5;

int n,m;
int aib[NMAX];

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

int Query(int x)
{
    int sum =0;
    for(int i = x; i> 0; i-=lsb(i))
    {
        sum+=aib[i];
    }
    return sum;
}

void ReadInput()
{
    int x;
    fin >> n >> m;
    for(int i = 1; i<=n ;++i){
        fin >> x;
        Update(i, x);
    }
}
void Solve()
{
    int cer, x, y;
    for(int i = 1;i <=m; ++i)
    {
        fin >> cer;
        if(cer ==0)
        {
            fin >> x >> y;
            Update(x,y);
        }
        else if(cer == 1)
        {
            fin >> x >> y;
            fout << Query(y) - Query(x-1) << '\n';
        }
        else
        {
            fin >>x;
            int k = 0,pas=1;
            for(;pas <= n; pas <<=1);
            for(;pas;pas>>=1)
            {
                if(k+pas <=n)
                {
                    if(aib[k+pas] <= x){
                        x-=aib[k+pas];
                        k+=pas;
                    }
                }
            }
            if(x == 0 && k > 0)
                fout << k << '\n';
            else
                fout << -1 << '\n';
        }
    }
}

int main()
{
    ReadInput();
    Solve();
}