#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define li long int
#define prnt_newline printf("\n")
#define fr0(a,b) for(i=0;i<a;i+=b)
#define fr1(a,b) for(i=1;i<=a;i+=b)
#define set_bits(x) __builtin_popcount(x)
#define sc1int(x) scanf("%d",&x)
#define sc2int(x,y) scanf("%d%d",&x,&y)
#define sc1li(x) scanf("%ld",&x)
#define sc2li(x,y) scanf("%ld%ld",&x,&y)
#define sc1ll(x) scanf("%lld",&x)
#define sc2ll(x,y) scanf("%lld%lld",&x,&y)
#define sc3ll(x,y,z) scanf("%lld%lld%lld",&x,&y,&z)
#define prntint(x) printf("%d",x)
#define prntli(x) printf("%d",x)
#define prntll(x) printf("%lld",x)
struct node
{
    ll x,y;
};
vector<node> arr(101);
int main()
{
    ll l,r,test,i,j,a,b,num,idx;
    sc1ll(num);
    ll hr=-1,vr=-1;
    map<int,int> mp1,mp2;
    ll sign;
    for(i=0;i<num;i++)
    {
        sc2ll(arr[i].x,arr[i].y);
        if(((hr==1)&&(vr==1))||((hr==-1)&&(vr==-1)))
        {
            if(arr[i].x==0)
                hr=1;
            if(arr[i].y==0)
                vr=1;
        }
    }
    bool flag=true;
    if(hr==1||vr==1)
    {
        if(hr==1&&vr==1)
        {
            printf("YES\n");
            return 0;
        }
        if(hr==1)
        {
            sign=0;
            if(arr[0].y>0)
                sign=1;
            else if(arr[0].y<0)
                sign=-1;
            for(i=1;i<num;i++)
            {
                if(arr[i].x==0)
                {
                    if(sign!=0)
                    {
                        if(arr[i].y!=0)
                        {
                            ll sgn=(arr[i].y>0)?1:-1;
                            if(sign!=sgn)
                            {
                                flag=false;
                                break;
                            }
                        }
                    }
                    else
                    {
                        if(arr[0].y>0)
                            sign=1;
                        else if(arr[0].y<0)
                            sign=-1;
                    }
                }
                else
                {
                    flag=false;
                    break;
                }
            }
        }
        else
        {
            sign=0;
            if(arr[0].x>0)
                sign=1;
            else if(arr[0].x<0)
                sign=-1;
            for(i=1;i<num;i++)
            {
                if(arr[i].y==0)
                {
                    if(sign!=0)
                    {
                        if(arr[i].x!=0)
                        {
                            ll sgn=(arr[i].x>0)?1:-1;
                            if(sign!=sgn)
                            {
                                flag=false;
                                break;
                            }
                        }
                    }
                    else
                    {
                        if(arr[0].x>0)
                            sign=1;
                        else if(arr[0].x<0)
                            sign=-1;
                    }
                }
                else
                {
                    flag=false;
                    break;
                }
            }
        }
    }
    else
        flag=false;
    if(flag==false)
        printf("NO\n");
    else
        printf("YES\n");
}