#include <cstdio>

#define lsb(x) (x & (-x))

FILE *fin = freopen("aib.in","r",stdin); FILE *fout = freopen("aib.out","w",stdout);

const int MAX_N = 100000 + 5;

/* -------- Data -------------*/
int n,m;
int aib[MAX_N];
/* -------- Data -------------*/

void Update(int position, int val)
{
    for(int i = position; i<=n; i+= lsb(i))
    {
        aib[i]+=val;
    }
}

int Query(int position)
{
    int result = 0;
    for(int i = position; i> 0; i-=lsb(i))
    {
        result+=aib[i];
    }
    return result;
}

void Read_Data()
{
    int x,a,b,i,op;
    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",&a,&b);
            Update(a,b);
        }
        else if(op == 1)
        {
            scanf("%d%d",&a,&b);
            printf("%d\n",Query(b)-Query(a-1));
        }
        else
        {
            scanf("%d",&a);
            int pas=1,k=0;
            for(;pas <=n ;pas <<=1);
            for(; pas; pas >>= 1)
            {
                if(k+pas<=n && aib[k+pas]<=a)
                {
                    a-=aib[k+pas];
                    k+=pas;
                }
            }
            if(a==0 && k > 0)
                printf("%d\n",k);
            else
                printf("-1\n");
        }
    }

}

int main()
{
    Read_Data();
}