//给出n个坐标,判断多边形的方向//
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
int a[1000];
int b[1000];
cin>>n;
for (int i=0;i<n;i++)
cin>>b[i]>>a[i];
double s;
for (int i=0;i<n-1;i++)
{
s=0.5*( (a[i+1] + a[i] )*( b[i+1] -b[i]);//根据面积的正负d>0,顺时针,else逆时针
if (d>0)
cout<<"Y"<<endl;
else
cout<<"N"<<endl;
return 0;
}