#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n; 
    int a,b;
    float slope;
    float slope1;
    int check=0;
    scanf("%d",&n);
    for(int a0 = 0; a0 < n; a0++){
        int x; 
        int y; 
        scanf("%d %d",&x,&y);
        if(a0==1)
            {slope=(float)(a-x)/(float)(b-y);
            }
        if(a0>1)
            {slope1=(float)(a-x)/(float)(b-y);
            if(slope1!=slope)
            {printf("NO");check=1;
            break;}}
        a=x;
        b=y;
    }
    if(check==0)
        {printf("YES");}
    return 0;
}