#include<stdio.h>
#define nmax 100005
int rez, poz, i, n, st, dr, x, mjc, m, op, a, b, s1, s;
int v[nmax];

void update()
{
    while (poz<=n)
    {
        v[poz]+=x;
        poz+=(poz-(poz&(poz-1)));
    }
}

int query()
{
    rez=0;
    while(poz>=1)
    {
        rez+=v[poz];
        poz&=(poz-1);
    }
    return rez;
}

int main()
{
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
    scanf("%ld %ld",&n,&m);
    for (i=1;i<=n;i++)
    {
        scanf("%ld",&x);
        poz=i;
        update();
    }
    for (i=1;i<=m;i++)
    {
        scanf("%ld",&op);
        if (op==0)
        {
            scanf("%ld %ld",&poz,&x);
            update();
        }
        if (op==1)
        {
            scanf("%ld %ld",&a,&b);
            poz=a-1;
            s1=query();
            poz=b;
            printf("%ld\n",query()-s1);
        }
        if (op==2)
        {
            scanf("%ld",&s);
            st=1;   dr=n;
            while(st<=dr)
            {
                mjc=(st+dr)/2;
                poz=mjc;
                if (query()<s)
                    st=mjc+1;
                else
                    dr=mjc-1;
            }
            poz=st;
            if ((query()==s)&&(st>=1)&&(st<=n))
                printf("%ld\n",st);
            else
                printf("-1\n");
        }
    }
    return 0;
}