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#include <bits/stdc++.h>
using namespace std;
int n, rs=0;
int main(){
cin >> n;
int A[n+1];
for(int i=0; i<n; i++){
cin >> A[i];
}
int n1;
n%2==0 ? n1=n/2 : n1=n/2+1;
for(int i=0; i<n1; i++){
for(int j=0; j<n; j++){
for(int k=0; k<n; k++){
i == j ? j++ : j=j;
i == k ? k++ : k=k;
j == k ? k++ : k=k;
if(A[i] + A[j] > A[k]){
rs++;
}
}
}
}
cout << rs/n;
}