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#include <algorithm>
#include <fstream>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int v[900];
int main()
{ int n;
fin>>n;
for(int i=1 ; i<=n ; i++)
fin>>v[i];
sort(v+1,v+n+1);
int i,j,k;
int nr=0;
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++;
}
else
break;
}
}
}
fout<<nr;
return 0;
}