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#include <iostream>
#include <fstream>
using namespace std;
int main()
{ ifstream f("nrtri.in");
ofstream g("nrtri.out");
unsigned int n;
f>>n;
unsigned int v[800],i,j,aux,k,nr=0;;
for(i=0;i<n;i++)
f>>v[i];
for(i=0;i<n-1;i++)
for(j=i+1;j<n;j++)
if(v[i]>v[j])
{
aux=v[i];
v[i]=v[j];
v[j]=aux;
}
for(i=0;i<n-2;i++)
for(j=i+1;j<n-1;j++)
for(k=j+1;k<n;k++)
if(v[i]+v[j]>v[k]&&v[i]+v[k]>v[j]&&v[k]+v[j]>v[i])
nr++;
g<<nr;
f.close();
g.close();
return 0;
}