271A_updated

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long int n,i,j,k,l,x,y,c;
    cin>>n;
    k=0;
    c=0;
    j=n;
    while(n)
    {
        cin>>x>>y;
        if(x>0)
            c++;
        else if(x<0)
        {
            k++;
        }
        n--;
    }
    if (c>=j-1 or k>=j-1)
    {
        cout<<"Yes"<<endl;
    }
    else
        cout<<"No"<<endl;
    return 0;
}