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#include <iostream>
#include <fstream>
using namespace std;
ofstream fout ("ntri.out");
ifstream fin ("ntri.in" );
int n,x,a,b,c,i,j,k,l,m,q,C,nrid;
int main(){
int numere[802];
C=0;
fin>>n;
for ( i=0;i<n;i++){
for(q=0;q<i;q++){
nrid=0;
if(numere[q]==numere[i]){
nrid=nrid+1;
}
}
if(nrid==0){fin>>numere[i];
}}
for(i=0;i<n;i++){
a=numere[i];
for(j=i+1;j<n;j++){
b=numere[j];
for(k=j+1;k<n;k++){
c=numere[k];
if(a+b>=c && a+c>=b && b+c>=a){
C=C+1;
}
}
}}
fout<<C;
}