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#include <iostream>
#include <fstream>
using namespace std;
int main(){
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int a[1000],s,n,i;
fin>>n;
for(i=1;i<=n;++i){
fin>>a[i];
}
for(i=1;i<n;++i){
for(int j=i+1;j<n;++j){
for(int k=j+1;k<=n;++k){
if(a[i]+a[j]>=a[k] && a[i]+a[k]>=a[j] && a[j]+a[k]>=a[i])++s;
}
}
}
fout<<s;
return 0;
}