/**
 *    @author     : Dipta Das
 *    @University : CUET CSE 11
 *    @Codeforces : diptadas
 *    @Topcoder   : dipta670
 *    @link       : www.fb.com/dipta.das
 */

#include <bits/stdc++.h>
using namespace std;

#define LL         long long
#define pll        pair<LL,LL>
#define mp         make_pair
#define fr         first
#define sc         second
#define pb         push_back

#define read(n)    scanf("%lld",&n)
#define mset(a,s)  memset(a,s,sizeof(a))
#define all(a)     a.begin(),a.end()

#define PI         acos(-1.0)
#define EPS        1e-9
#define MOD        1000000007
#define INF        1e9
#define NN         1000009


int main()
{

#ifdef One_1
    //freopen("input.txt","r",stdin);
#endif

    //ios_base::sync_with_stdio(0),cin.tie(0);

    LL i,j,k,n,m;
    LL x1,x2,x3,y1,y2,y3;

    read(n);
    read(x1);
    read(y1);
    read(x2);
    read(y2);

    bool ans;

    if(x1==x2 || y1==y2) ans=1;
    else ans=0;

    for(i=2;i<n;i++)
    {
        read(x3);
        read(y3);

        LL p=(x3-x1)*(y1-y2);
        LL q=(x1-x2)*(y3-y1);

        if(p!=q) ans=0;
    }

    if(ans) printf("YES");
    else printf("NO");

    return 0;
}