#include <bits/stdc++.h>

using namespace std;
#define sd(x) scanf("%d",&x)
#define sll(x) scanf("%lld",&x)
#define sull(x) scanf("%llu",&x)
#define pd(x) printf("%d",x)
#define pull(x) printf("%llu",x)
#define pll(x) printf("%lld",x)

#define pn() printf("\n")
#define loop(i, a, b) for (int i = int(a); i < int(b); i++)
#define MAXN 1000005
#define MOD 1000000007 //10^9 +7
typedef long long int ll;
typedef unsigned long long int ull;
ll a[15][2];
int main()
{   int n;
    ll c;
    double m;
    int flag=1;
    cin>>n;
    loop(i,0,n)cin>>a[i][0]>>a[i][1];
    if(a[0][0]==a[1][0]){
         loop(i,2,n){
            if(a[i][0]!=a[0][0]){
                flag=0;
                break;
            }
        }
    }
    else{
        m = (a[0][1]-a[1][1])/(a[0][0]-a[1][0]);
        c = a[0][1]-m*a[0][0];
        loop(i,2,n){
            if(a[i][1]!=(m*a[i][0]+c)){
                flag=0;
                break;
            }
        }
    }
    if(flag)cout<<"YES\n";
    else cout<<"NO\n";

    return 0;
}