#include <iostream>
#include <string.h>

using namespace std;

int selections(int n, int r)
{
    if(r == 0) { return 1;}

    int out = 1.0;

    for(int i = 0; i < r; i++){ out *= (n-i); out /= (i+1);}

    return out;
}

main()
{
  int n; cin >> n;
  int angle;
  int angle_counts[180]; memset(angle_counts, 0, sizeof(angle_counts));
  char inp[1000]; cin >> inp;
  char save[1000]; strcpy(save, inp);
  char *token = strtok(inp, ",");

  int m = 0;
  while (token != NULL)
  {
      angle = stoi(token);
      if(angle <= -90 || angle > 90)
      {
        cout << "Invalid Input Angles " << save << '\n';
        exit(1);
      }

      angle_counts[angle+89]++;
      token = strtok(NULL, ",");
      m++;
  }

  if(m != n) { cout << "Invalid Input N " << n << '\n'; exit(1);}

  int ans = selections(n, 3);
  for(int i = 0; i < 180; i++)
  {
    if(angle_counts[i] > 1) {
      ans -= (n-angle_counts[i])*selections(angle_counts[i], 2);
    }
    if(angle_counts[i] > 2) {
      ans -= selections(angle_counts[i], 3);
    }
  }

  cout << ans << '\n';
}