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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("nrtri.in");
ofstream out("nrtri.out");
int n,v[850],c[30100],u[850],k,nr,mj,a,b;
int caut_bin(int st, int dr)
{
mj=st+(dr-st)/2;
if(v[mj]>a+b)
caut_bin(st,dr-1);
else{
nr++;
if(mj==dr)
return mj;
else{
if(v[mj+1]>a+b)
return mj;
else
return caut_bin(mj+1,n);
}
}
}
int main()
{
in>>n;
for(int i=1;i<=n;i++)
{
in>>v[i];
if(v[i]>k)
k=v[i];
}
for (int i=1;i<=n;i++)
{
c[v[i]]=c[v[i]]+1;
}
for (int i=1;i<=k;i++)
{
c[i]=c[i]+c[i-1];
}
for (int i=1;i<=n;i++)
{
u[c[v[i]]-1]=v[i];
c[v[i]]=c[v[i]]-1;
}
for(int i=0;i<n-2;i++)
{
a=u[i];
b=u[i+1];
caut_bin(i+2,n-1);
}
out<<nr;
return 0;
}