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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("nrtri.in");
ofstream out("ntri.out");
int main()
{
int n,v[805], c=0;
in>>n;
for(int i=1;i<=n;i++)
in>>v[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
{
if(j==i)
j++;
for(int z=1;z<=n;z++)
{
while(j!=z&&i!=z)
z++;
if(v[i]<=v[j]&&v[j]<=v[z]&&v[i]+v[j]==v[z])
c++;
}
}
}
out<<c;
return 0;
}