#include <stdio.h>
#include <set>
using namespace std;

#define NMAX 1010

int N;

set <pair<int, int> > H;

pair <int, int> a[NMAX];

int beg;
char s[100];

int gen(int N)
{
	freopen("patrate3.in", "w", stdout);

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

	for (int i = 1; i <= N; i++)
		printf("%d.%d %d.%d\n", rand() % 10000, rand() % 10000, rand() % 10000, rand() % 10000);

fclose(stdout);
return 0;
}

int GET()
{
	int q = 0;

	for (; s[beg] && '0' <= s[beg] && s[beg] <= '9'; beg++)
		q = q * 10 + s[beg] - '0';

return q;
}

void SKIP()
{
	for (; s[beg] && s[beg] == ' '; beg++);
}

int main()
{
//	gen(1000);
	
	int x, x1, y, y1, xx, yy, xp, yp, x1p, y1p, i, j;
	
	freopen("patrate3.in", "r", stdin);
	freopen("patrate3.out", "w", stdout);

	scanf("%d", &N);

	for (i = 1; i <= N; i++) {
		//scanf("%d.%d %d.%d", &x, &x1, &y, &y1);

		fgets(s, 100, stdin);

		beg = 0;

		int e = 0, e1 = 0;
		if (s[beg] == '-') e = 1, beg++;

		x = GET();
		beg++;
		x1 = GET();
		SKIP();

		if (s[beg] == '-') e1 = 1, beg++;
		y = GET();
		beg++;
		y1 = GET();

		if (!e) xx = x * 10000 + x1;
		else xx = (-x) * 10000 - x1;

		if (!e1) yy = y * 10000 + y1;
		else yy = (-y) * 10000 - y1;
//		xx = x; yy = y;

		a[i] = make_pair(xx, yy);
		H.insert(make_pair(xx, yy));
	}

	int nr = 0;

//	int nr1 = 0;
	
	for (i = 1; i <= N; i++)
		for (j = i + 1; j <= N; j++) {
			if (a[i].second >= a[j].second) x = a[i].first, y = a[i].second, x1 = a[j].first, y1 = a[j].second;
			else x = a[j].first, y = a[j].second, x1 = a[i].first, y1 = a[i].second;

			yp = y - (x - x1);
			y1p = y1 - (x - x1);
			
			xp = x + (y - y1);
			x1p = x1 + (y - y1);

//			printf("%d %d | %d %d | %d %d | %d %d\n", x, y, x1, y1, xp, yp, x1p, y1p);


			if (H.find(make_pair(xp, yp)) != H.end() && H.find(make_pair(x1p, y1p)) != H.end()) {
//				printf("%d %d | %d %d | %d %d | %d %d\n", x, y, x1, y1, xp, yp, x1p, y1p);

				nr++;
			}

/*			yp = y + (x - x1);
			y1p = y1 + (x - x1);

			xp = x - (y - y1);
			x1p = x1 - (y - y1);

			if (H.find(make_pair(xp, yp)) != H.end() && H.find(make_pair(x1p, y1p)) != H.end()) nr1++;
*/
		}

//	if (nr != nr1) while (1);
//	if (nr & 1) while (1);

	printf("%d\n", nr / 2);
//	printf("%d\n", nr1);

fclose(stdin);
fclose(stdout);
return 0;
}