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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int k;
fin>>k;
int s[k+2];
for(int i=0; i<k; ++i)
fin>>s[i];
int p=0;
for(int i=0; i<k; ++i){
for(int j=i+1; j<k; ++j)
for(int l=j+1; l<k; ++l)
if(s[i]+s[j]>=s[l])
if(s[i]+s[l]>=s[j])
if(s[j]+s[l]>=s[i]){
++p;
}
}
fout<<p;
return 0;
}