#include <cstdio>
using namespace std;
#define MAXN 100004

int n,m,i,j,tip,x,y;
int v[MAXN];

int binar(int nr)
{
    int p=1;
    while( (nr&1) == 0 )
    {
        nr=nr>>1;
        p=p<<1;
    }
    return p;
}

void adauga(int poz, int val)
{
    for(int i=poz; i<=n; i+=binar(i))
        v[i]+=val;
}

int sum(int poz)
{
    int s=0;
    for(int i=poz; i>=1; i-=binar(i))
        s+=v[i];

    return s;
}


int caut(int x)
{
    int st=1, dr=n,mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(x == sum(mij))
            return mij;
        if(x<sum(mij))
            dr=mij-1;
        else
            st=mij+1;
    }
    return -1;

}


void afis()
{
    for(int i=1; i<=n; i++)
        printf("%d ",v[i]);
    printf("\n");
}
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);
        adauga(i,x);
    }
    for(i=1; i<=m; i++)
    {
        scanf("%d",&tip);
        if(!tip)
        {
            scanf("%d%d",&x,&y);
            adauga(x,y);
        }
        if(tip==1)
        {
            scanf("%d%d",&x,&y);
            printf("%d\n",sum(y)-sum(x-1));
        }
        if(tip==2)
        {
            scanf("%d",&x);
            //printf("%d\n",caut(1,n,x));
            printf("%d\n",caut(x));
        }
    }
}