#include #include #include using namespace std; const int maxn=200005; struct node { int x,y; } p[maxn]; int main() { int n; int i; while(scanf("%d",&n),n) { for(i=1; i<=n; i++) { scanf("%d%d",&p[i].x,&p[i].y); } int sum=0; int ans=0; for(i=1; i<=n; i++) { if((p[i].xp[n/2+1].y)||(p[i].x>p[n/2+1].x&&p[i].yp[n/2+1].x&&p[i].y>p[n/2+1].y)) { ans++; } } cout<