#include <cstdio>
#define Nmax 100005
using namespace std;

FILE *in = fopen("aib.in","r");
FILE *out = fopen("aib.out","w");

int n,t,aib[Nmax];

void adauga(int poz,int s)
{
    while(poz<=n)
    {
        aib[poz]+=s;
        poz+=(poz&(-poz));
    }
}

int query(int poz)
{
    int suma=0;
    while(poz!=0)
    {
        suma+=aib[poz];
        poz-=(poz&(-poz));
    }
    return suma;
}

int sumin(int suma)
{
    int r=0,pas=1<<15;
    while(pas)
    {
        if(r+pas<n)
            if(query(r+pas)<suma)
            r+=pas;
        pas/=2;
    }
    if(query(r+1)==suma)
    return r+1;
    return -1;
}

int main()
{
    fscanf(in,"%d%d",&n,&t);
    for(int i=1;i <= n ;i++)
    {
        int x;
        fscanf(in,"%d",&x);
        adauga(i,x);
    }
   /* for(int i=1;i <= n ;i++)
        fprintf(out,"%d ",query(i));*/
    while(t)
    {
        int cer,x,y;
        fscanf(in,"%d",&cer);
        if(cer==0)
        {
            fscanf(in,"%d%d",&x,&y);
            adauga(x,y);
        }
        else if(cer==1)
        {
            fscanf(in,"%d%d",&x,&y);
            fprintf(out,"%d\n",query(y)-query(x-1));
        }
        else
        {
            fscanf(in,"%d",&x);
            fprintf(out,"%d\n",sumin(x));
        }
        t--;
    }
    return 0;
}