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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int v[801];
int main() {
int n, i, j, k, cont=0, sum, lat;
f>>n;
for (i=1; i<=n; i++){
f>>v[i];
}
sort (v+1, v+n+1);
for (i=1; i<=n-2; i++){
for (j=i+1; j<=n-1; j++){
for (k=j+1; k<=n; k++) {
sum=v[i]+v[j];
lat=v[k];
if (sum>=lat){
cont++;
}
else{
break;
}
}
}
}
g<<cont;
return 0;
}