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