at 181C

#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> P;
P p[110];
int main()
{
    int n;
    cin >> n;
    map<P, int> mp;
    for (int i = 0; i < n; i++)
    {
        cin >> p[i].first >> p[i].second;
    }


    bool f = false;

    for (int i = 0; i < n - 2; i++)
    {
        for (int j = i + 1; j < n - 1; j++)
        {
            for (int k = j + 1; k < n; k++)
            {
                if ((p[i].first - p[j].first) * (p[i].second - p[k].second) == (p[i].first - p[k].first) * (p[i].second - p[j].second))
                {
                    f = true;
                    break;
                }
            }
            if (f)
                break;
        }
        if (f)
            break;
    }

    if (f)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;
    return 0;
}