#include<cstdio>
#define LSB(x) ((-x)&x)
using namespace std;
int AIB[100001],n,m;
void UpDate(int x,int val)
{
    for (int i=x;i<=n;i+=LSB(i))
    {
        AIB[i]+=val;
    }
}
int Sum(int x)
{
    int s=0;
    for (int i=x;i>0;i-=LSB(i))
        s+=AIB[i];
    return s;
}
int caut(int x)
{
    int st=1,dr=n,mij;
    while (dr-st>1)
    {
        mij=(dr+st)/2;
        if (Sum(mij)>=x) dr=mij;
            else st=mij;
    }
    return Sum(st)==x ? st : Sum(dr)==x ? dr : -1;
}
int main()
{
    int i,op,x,y;
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
    scanf("%d%d",&n,&m);
    for (i=1;i<=n;++i)
    {
        scanf("%d",&x);
        UpDate(i,x);
    }
    for (i=1;i<=m;++i)
    {
        scanf("%d",&op);
        if (op==0)
        {
            scanf("%d%d",&x,&y);
            UpDate(x,y);
        }
        else if (op==1)
            {
                scanf("%d%d",&x,&y);
                printf("%d\n",Sum(y)-Sum(x-1));
            }
            else
            {
                scanf("%d",&x);
                printf("%d\n",caut(x));
            }
    }
    return 0;
}