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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
long n,v[803],i,s,j,nr;
long long t;
int comp(long a,long b)
{
return a<b;
}
int main()
{
f>>n;
for (i=1;i<=n;i++)
f>>v[i];
sort(v+1,v+n+1,comp);
for (i=1;i<=n-2;i++)
for (j=i+1;j<n;j++)
{
s=v[i]+v[j];
nr=upper_bound(v+1,v+n+1,s)-v-1;
t+=nr-j;
}
g<<t;
f.close();
g.close();
return 0;
}