#include <cstdio>
using namespace std;
int N,M,AIB[100005],tipOp,a,b,i;
long long x;
void update(int i,int x)
{
    for (;i<=N;i+=i&-i) AIB[i]+=x;
}
int query(int x)
{
    int S=0;
    for (;x;x-=x&-x) S+=AIB[x];
    return S;
}
int cb(int x,int L,int R)
{
    if (L>R) return -1;
    int M=(L+R)>>1,S=query(M);
    if (S==x)
    {
        register int j=M;
        while (S==M);
        return j;
    }
    else if (S>x) cb(x,L,M-1);
    else if (S<x) cb(x,M+1,R);
}
int main()
{
    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",&tipOp);
        if (tipOp==0)
        {
            scanf("%d %d",&a,&b);
            update(a,b);
        }
        else if (tipOp==1)
        {
            scanf("%d %d",&a,&b);
            printf("%d\n",query(b)-query(a-1));
        }
        else
        {
            scanf("%d",&x);
            printf("%d\n",cb(x,1,N));
        }
    }
    return 0;
}