#include <iostream>
#include <cstdio>
#define NMAX 4*100005
using namespace std;

int n,m,a[NMAX],x;

int update_indice(int nr)
{
    return ((nr xor (nr-1))&nr);
}

void update(int nr,int indice)
{
    while (indice<=n)
    {
        a[indice]+=nr;
        indice+=update_indice(indice);
    }
}
int calc_sum(int poz)
{
    int sum=0;
    while (poz)
    {
        sum+=a[poz];
        poz-=update_indice(poz);
    }
    return sum;
}
int caut_bin(int sum)
{
    int st=1,dr=n;
    while (st<=dr)
    {
        int mij=(st+dr)/2;
        int s=calc_sum(mij);
        if (sum<s)
            dr=mij-1;
        else if (sum>s)
            st=mij+1;
        else
            return mij;
    }
    return -1;
}
int main()
{
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
    scanf("%d%d",&n,&m);
    for (int i=1; i<=n; ++i)
    {
        scanf("%d",&x);
        update(x,i);
    }
    for (int i=1; i<=m; ++i)
    {
        int op,nr1,nr2;
        scanf("%d",&op);
        if (op<2)
        {
            scanf("%d%d",&nr1,&nr2);
            if (op==0)
                update(nr2,nr1);
            else if (op==1)
            {
                printf("%d\n",calc_sum(nr2)-calc_sum(nr1-1));
            }
        }
        else
        {
            scanf("%d",&nr1);
            printf("%d\n",caut_bin(nr1));
        }
    }
    return 0;
}