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#include <fstream>
using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int v[100000],x,y,a,aux,n,m,k,i,j,mx,t,s;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++) f>>v[i];
for(i=1;i<=m;i++)
{
f>>a;
if(a==0)
{
f>>x>>y; v[x]+=y;
}
if(a==1)
{
f>>x>>y;
s=0;
for(j=x;j<=y;j++)
s=s+v[j];
g<<s<<endl;
}
if(a==2)
{
f>>x;
for(j=1;j<=n;j++)
{
s=0;
for(t=1;t<=j;t++)
s=s+v[t];
if(s==x){g<<j<<endl;break;}
}
}
}
return 0;
}