#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,left,right,x,y;
    left=right=0;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>x>>y;//统计x>0和x<0的个数
        if(x>0)
            right++;
        else
            left++;
    }
    if(right<=1 || left<=1)//判断，输出
        cout<<"Yes"<<endl;
    else
        cout<<"No"<<endl;
    return 0;
}