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#include <fstream>
#include <algorithm>
#include <iostream>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int n,m,i,j,a[805],ap=0,p1,p2,s;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
{
fin>>a[i];
}
sort(a+1,a+n+1);
for(i=1;i<=n;i++)
{
for(j=i+1;j<=n;j++)
{
s=a[i]+a[j];
p2=upper_bound(a+1,a+n+1,s)-a;
//cout<<p2<<" "<<a[i]<<" "<<a[j]<<endl;
ap=ap+(p2-j)-1;
}
}
fout<<ap;
return 0;
}