#include <stdio.h>
using namespace std;
#define zeros(x) ( (x ^ (x - 1)) & x )
FILE *fin = fopen("aib.in", "r");
FILE *fout = fopen("aib.out", "w");
int n;
unsigned int aib[100001];
void update(int pos, unsigned int add)
{
    int i;
    for(i=pos;i<=n;i+=zeros(i))
    {
        aib[i]+=add;
    }
}
int sum(int pos)
{
    int i;
    unsigned int total = 0;
    for(i=pos;i>=1;i-=zeros(i))
    {
        total += aib[i];
    }
    return  total;
}
int binar(int a)
{
    int start = 0;
    int adaug = 1<<16;
    while(adaug>0)
    {
        if(start+adaug<=n && aib[start+adaug]<=a)
        {
            start+=adaug;
            a-=aib[start];
        }
        adaug/=2;
    }
    if(a!=0) return -1;
    return start;
}
int main()
{
    int m,op;
    fscanf(fin, "%d%d", &n, &m);
    for(int i=1;i<=n;i++)
    {
        int x;
        fscanf(fin, "%d", &x);
        update(i,x);
    }
    for(int i=1;i<=m;i++)
    {
        fscanf(fin, "%d", &op);
        if(op==0)
        {
            int x,y;
            fscanf(fin, "%d%d", &x, &y);
            update(x,y);
        }
        if(op==1)
        {
            int x,y;
            fscanf(fin, "%d%d", &x,&y);
            fprintf(fout, "%d\n", sum(y) - sum(x-1));
        }
        if(op==2)
        {
            int x;
            fscanf(fin, "%d", &x);
            fprintf(fout, "%d\n", binar(x));
        }
    }
}