> #include<iostream>
> 
> using namespace std;
> #define N 702
> 
> class test
> {
> private:
> 	int xi[N], yi[N];
> 	int number;
> public:
> 	void set(int n);
> 	int each(int i, int j, int k);
> 	void fun();
> };
> 
> void test::set(int n)
> {
> 	int i;
> 	
> 	number = n;
> 	for (i=0; i<number; i++)
> 	{
> 		cin >> xi[i] >> yi[i];
> 	}
> }
> 
> int test::each(int i, int j, int k)
> {
> 	int a1, b1;
> 	int a2, b2;
> 	
> 	a1 = xi[j] - xi[i]; b1 = yi[j] - yi[i];
> 	a2 = xi[k] - xi[i]; b2 = yi[k] - yi[i];
> 	
> 	return (a1 * b2) - (a2 * b1);
> }
> 
> void test::fun()
> {
> 	int i, j, k;
> 	int pointNumber;
> 	int Rpoint;
> 	
> 	pointNumber = 2;
> 	for (i=0; i<number-2; i++)
> 	{
> 		for (j=i+1; j<number; j++)
> 		{
> 			Rpoint = 2;	
> 			for (k=j+1; k<number; k++)
> 			{
> 				if (!each(i, j, k))
> 					Rpoint++;
> 			}
> 			if (Rpoint > pointNumber)
> 			{
> 				pointNumber = Rpoint;
> 			}
> 		}
> 	}
> 	cout << pointNumber << endl;
> }
> 
> int main()
> {
> 	int count;
> 	test Point;
> 	
> 	cin >> count;
> 	Point.set(count);
> 	Point.fun();
> 	
> 	return 0;
> }