using namespace std;
#include <fstream>
ifstream fin ("aib.in");
ofstream fout("aib.out");

const int Nmax = 100005;

int n, log;
int AIB[Nmax];

void update(int, int) ;
int sum(int) ;
int search(int) ;

int main()
{
	int i, a, b, m, tip;
	fin >> n >> m;
	for(log = 0; (1<<log) < n; ++log) ;
	for(i = 1; i <= n; ++i) {fin >> a; update(i, a);}
	for(; m; --m)
	{
	    fin >> tip;
	    if(tip == 0)
            {fin >> a >> b; update(a, b);}
        else if(tip == 1)
        {
            fin >> a >> b;
            fout << sum(b) - sum(a-1) << '\n';
        }
        else
        {
            fin >> a;
            fout << search(a) << '\n';
        }
	}
	return 0;
}


void update(int poz, int x)
{
    for(; poz <= n; poz += (poz & -poz))
        AIB[poz] += x;
}

int sum(int poz)
{
    int s = 0;
    while(poz) {s += AIB[poz]; poz &= poz-1;}
    return s;
}


int search(int sum)
{
    int lg = (1 << log), idx = 0;
    while(lg && sum)
    {
        if(idx + lg <= n)
        {
            if(AIB[idx + lg] == sum) return idx + lg;
            else if(AIB[idx + lg] < sum) idx += lg, sum -= AIB[idx];
        }
        lg >>= 1;
    }
    return -1;
}