#include<iostream.h>
#include<fstream.h>
#define N 100001
long n,m,y,z,i,j,step,c[N],a[N],s;
int x;

long suma(long y,long z)
{s=0;
for(;y>0||z>0;y-=(y&(-y)),z-=(z&(-z)))
       s+=c[z]-c[y];
return s;}
       
long pozitie(long step,long p)
{for(i=0;step!=0;step>>=1)
if(i+step<=n)
       if(c[i+step]<p)
               {i+=step;
               p-=c[i];}
       else
               if(c[i+step]==p)
                      return i+step;
return -1;}

int main()
{fstream f1("aib.in",ios::in);
fstream f2("aib.out",ios::out);
f1>>n>>m;
for(step=1;step<=n;step<<=1);
step>>=1;
a[0]=0;
for(i=1;i<=n;i++)
       {f1>>a[i];
       a[i]+=a[i-1];
       j=i-(i&(-i));
       c[i]=a[i]-a[j];}
for(i=1;i<=m;i++)
       {f1>>x>>y;
       if(x==2)
              f2<<pozitie(step,y)<<endl;
       else
              {f1>>z;
              if(x==0)
                      {while(y<=n)
                             {c[y]+=z;
                             y+=(y&(-y));}}
              else
                      f2<<suma(y-1,z)<<endl;}}
f1.close();
f2.close();
return 0;}