package main
import "fmt"

type Point struct {
    X int
    Y int
}

func main() {
 var n int
    fmt.Scan(&n)
    points := make([]Point, n)
    for i := 0; i < n; i++ {
        var x, y int
        fmt.Scan(&x, &y)
        points[i] = Point{X: x, Y: y}
    }
    xCoeff := points[1].Y - points[0].Y
    yCoeff := points[1].X - points[0].X
    rhs :=  points[1].X*points[0].Y - points[1].Y*points[0].X
    for _, p := range(points) {
       if p.X*xCoeff + p.Y*yCoeff != rhs {
           fmt.Println("NO")
           return
       }
    }
    fmt.Println("YES")
}