#include<fstream>
using namespace std;
ifstream fin("aib.in");
ofstream fout("aib.out");
int n,m,x,a,b,A[100005];
inline void update(int p, int x)
{
    for (;p<=n;p+=(p&-p))
        A[p]+=x;
}
inline int suma(int p)
{
    int s=0;
    for (;p>0;p-=(p&-p))
        s+=A[p];
    return s;
}
inline int cautaresuma(int p)
{
    int st,dr,mij;
    st=1, dr=n;
    while (st<=dr)
    {
        mij=st+(dr-st)/2;
        if (suma(mij)>p)
            dr=mij-1;
        else
            st=mij+1;
    }
    if (suma(dr)==p) return dr;
    else return -1;
}
int main()
{
    int i;
    fin>>n>>m;
    for (i=1;i<=n;++i)
    {
        fin>>x;
        update(i,x);
    }
    for (i=1;i<=m;++i)
    {
        fin>>x;
        switch (x)
        {
            case 0:
                fin>>a>>b;
                update(a,b);
            break;
            case 1:
                fin>>a>>b;
                fout<<suma(b)-suma(a-1)<<"\n";
            break;
            case 2:
                fin>>a;
                fout<<cautaresuma(a)<<"\n";
            break;
        }
    }
    return 0;
}