#include<stdio.h>
#include<math.h>
#define N 15001
int num,n;
bool fol[N];
struct milk{double x,y;}v[N];
void parcurg()
{
	for (int i=1; i<n-1; ++i)
	{
		for (int j=i+1; j<n; ++j)
		{
			double modab=(v[i].x-v[j].x)*(v[i].x-v[j].x)+(v[i].y-v[j].y)*(v[i].y-v[j].y);
			double ab=sqrt(modab)*1000;
			
			for (int k=j+1; k<=n; ++k)
			{
				double modac=(v[i].x-v[k].x)*(v[i].x-v[k].x)+(v[i].y-v[k].y)*(v[i].y-v[k].y);
				double ac=sqrt(modac)*1000;
				
				double modbc=(v[k].x-v[j].x)*(v[k].x-v[j].x)+(v[k].y-v[j].y)*(v[k].y-v[j].y);
				double bc=sqrt(modbc)*1000;
				
				if (ab==bc&& bc==ac)
					++num;
			}
		}
	}
	printf("%d",num);
}
void citire()
{
	freopen("triang.in","r",stdin);
	freopen("triang.out","w",stdout);
	scanf("%d",&n);
	for (int i=1; i<=n; ++i)
		scanf("%b%b",&v[i].x,&v[i].y);
	parcurg();
}
int main()
{
	citire();
	return 0;
}