#include<cstdio>#include<cstring>#include<cstdlib>#include<iostream>#include<cmath>using namespace std;const double PI=acos(-1.0);struct point{ double x,y; point(double x0=0,double y0=0){ x=x0; y=y0;}}p[100];double dist(point a,point b){ return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));}int main(){int n;double r;while ( scanf("%d%lf",&n,&r)!=EOF ){ scanf("%lf%lf",&p[0].x,&p[0].y); for (int i=1;i<=n;i++) scanf("%lf%lf",&p[i].x,&p[i].y); int ok; for (int k=0;k<100000;k++){ point tp=point(r*cos(PI*2*k/100000.0),r*sin(PI*2*k/100000.0)); ok=true; for (int i=1;i<=n;i++) if ( dist(tp,p[0])>dist(tp,p[i])-1e-6 ){ ok=false; break; } if ( ok ){ break; } } if ( ok ) printf("Yesn"); else printf("Non");}}
