#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;


int main(){
    int n,x,y,tempX,tempY;
    cin >> n;
    cin>>tempX>>tempY;
    cin>>x>>y;
    if(x-tempX!=0){
        float m =(float)(y-tempY)/(x-tempX);
    for(int a0 = 2; a0 < n; a0++){
        cin >> x >> y;
        if((x-tempX)!=m*(y-tempY)){
            cout<<"NO"<<endl;
            return 0;
        }else{
            tempX=x;
            tempY=y;
        }
    }
    }else{
        for(int a0 = 2; a0 < n; a0++){
            cin>>x>>y;
            if(x-tempX!=0){
                cout<<"NO"<<endl;
                return 0;
            }
            else{
                tempX=x;
            }
        }
    }
    cout<<"YES"<<endl;
    return 0;
}