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#include <iostream>
#include <vector>

using namespace std;

struct line {
    int count = 0, k, b;
};

bool cmp(pair<int, int> c1, pair<int, int> c2) {
    return (c1.first == c2.first && c1.second == c2.second);
}

bool PointIsOnLine(int m, int c, int x, int y) {
    if (y == ((m * x) + c))
        return true;
    return false;
}

pair<int, int> f(pair<int, int> c1, pair<int, int> c2) {
    int x1 = c1.first;
    int y1 = c1.second;
    int x2 = c2.first;
    int y2 = c2.second;

    int k = (y2 - y1) / (x2 - x1);
    int b = -(x1 * y2 - x1 * y1 - x2 * y1 + x1 * y1) / (x2 - x1);

    pair<int, int> ans = { k, b };
    return ans;
}

int main() {
    int n;
    cin >> n;
    vector<pair<int, int>> a(n);

    for (int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
    }

    vector<line> lines;
    pair<int, int> temp;
    bool ln1 = false, ln2 = false;

    vector<int> not_in;

    pair<int, int> e = f(a[0], a[1]);
    line smth; smth.b = e.first; smth.k = e.second; smth.count = 0;

    lines.push_back(smth);

    for (int i = 2; i < n; i++) {
        bool flag = false;
        if (lines.size() != 4) {
            for (int j = 0; j < lines.size(); j++) {
                if (PointIsOnLine(lines[j].b, lines[j].k, a[i].first, a[i].second)) {
                    flag = true;
                    lines[j].count++;
                }
            }
            if (!flag) {
                not_in.push_back(i);
                if (not_in.size() >= 2) {
                    e = f(a[not_in[not_in.size() - 2]], a[not_in[not_in.size() - 1]]);
                    smth.b = e.first; smth.k = e.second; smth.count = 0;
                    lines.push_back(smth);
                }
            }
        }
        else {
            cout << "no";
            return 0;
        }
    }

    if (lines.size() <= 2) {
        cout << "yes";
    }
    else if (lines.size() == 3 && (PointIsOnLine(lines[1].b, lines[1].k, a[0].first, a[0].second) || PointIsOnLine(lines[2].b, lines[2].k, a[0].first, a[0].second)) && (PointIsOnLine(lines[2].b, lines[2].k, a[1].first, a[1].second) || PointIsOnLine(lines[2].b, lines[2].k, a[1].first, a[1].second))) {
        cout << "yes";
    }
    else {
        cout << "no";
    }
}