#include<cstdio>

#include<cmath>

#include<algorithm>

using namespace std;

#define EPS 0.00000001

#define INF 99999999999999999999.0

#define N 201

typedef double db;

int n,m,sta,ans;

db xs[N],ys[N],line[N*N];

int main()

{

	scanf("%d",&n);

	for(int i=1;i<=n;++i)

	  scanf("%lf%lf",&xs[i],&ys[i]);

	for(int i=1;i<=n;++i)

	  for(int j=i+1;j<=n;++j)

	    line[++m]=(fabs(xs[i]-xs[j])<EPS?INF:(ys[i]-ys[j])/(xs[i]-xs[j]));

	sort(line+1,line+m+1);

	for(int i=1;i<=m;++i)

	  if(i==1||fabs(line[i]-line[i-1])>EPS)

	    ++ans;

	printf("%d\n",ans);

	return 0;

}