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