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#include <iostream>
using namespace std;
int n, v[101], c = 0;
int triunghi(int a, int b, int c) {
return (a + b > c) && (a + c > b) && (c + b > a);
}
int main() {
cin >> n;
for(int i = 1; i <= n; i++)
cin >> v[i];
for(int i = 1; i < n-1; i++)
for(int j = i + 1; j < n; j++)
for(int k = j + 1; k <= n; k++)
if(triunghi(v[i], v[j], v[k])) {
c++;
//cout << v[i] <<' '<< v[j] <<' '<< v[k] << endl;
}
cout << c;
return 0;
}