#include<iostream>
using namespace std;

struct Combine
{
	int row;
	int col;
};
Combine combine[702];

int main()
{
	int N, i, j, p, sum;
	int total[50000];
	while(cin >> N && N ) {
		for(i = 0; i < N; i ++)
			scanf("%d%d", &combine[i].row, &combine[i].col);
			//cin >> combine[i].row >> combine[i].col;
		int gg = 0;
		memset(total, 0, sizeof(total));
		if(N == 1) {
			printf("1\n");
			break;
		}
		for(i = 0; i < N; i ++) {
			for(j = i + 1; j < N; j ++) {
				sum = 2;
				for(p = j + 1; p < N; p ++) {
					if(combine[i].row * combine[p].col == combine[i].col * combine[p].row)    //(x1, y1), (x2, y2)  计算 x1*y2 == x2*y1
						sum ++;
				}
				total[gg ++] = sum;
			}
		}
		int max = -1;
		for(i = 0; i < gg; i ++) {
			if(total[i] > max)
				max = total[i];
		}
		printf("%d\n", max);
	}
	return 0;

}