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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int main()
{
int N,v[800],i,c=0,k,j;
f>>N;
for(i=1;i<=N;i++){
f>>v[i];
}
for(i=1;i<=N-2;i++){
for(j=i+1;j<=N-1;j++){
for(k=j+1;k<=N;k++){
if(i==j){
j++;
}
if(j==k){
k++;
}
if(i==k){
k++;
}
if(v[i]<=v[j]+v[k]){
c++;
}
}
}
}
g<<c;
g.close();
f.close();
return 0;
}