#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;

#define inf 1000000

int main(){
    int n,b=0,d=0,p,q;
    float m,c;
    cin >> n;
    for(int a0 = 0; a0 < n; a0++){
        int x;
        int y;
        cin >> x >> y;
        
        if(a0==0) { p=x;q=y;}
        else if(a0==1){
            if(x==p);
            else m=(y-q)/(x-p); c=y-m*x; b++; }
        else{
            if(y-m*x==c) b++;
        }
        if(x==p){
            d++;
        }
    }
    if(b==n-1 || d==n) cout<<"YES";
        else cout<<"NO";
    
    return 0;
}