#include #include #include #include #include #include #include #include #include #include #include #include #include #define int long long using namespace std; #define all(x) (x).begin(),(x).end() #define rep(i,n) for (int i=0;i<(n);++i) #define prep(i,n) for (int i=1;i<=(n);++i) #define ep(i,j,n) for (int i=j+1;i<=(n);++i) int INF = 900000000000000; int mod=998244353; signed main(){ int n;cin>>n; double a,b,c,d,e,f;cin>>a>>b>>c>>d>>e>>f; double x,y; double p,q;if(bf){p=f;} if(ae){pp=e;} if(a==c && a==e){x=a;y=(p+q)/2;} else{ if(b==d && d==f){ x=(pp+qq)/2;y=b; } else{ if(a==c){ y=((e-a)*(a*a+b*b-c*c-d*d)-(c-a)*(a*a+b*b-e*e-f*f))/(2*(e-a)*(b-d)-2*(c-a)*(b-f)); x=(2*(b-f)*y-a*a-b*b+e*e+f*f)/(2*(e-a)); } else{ y=((e-a)*(a*a+b*b-c*c-d*d)-(c-a)*(a*a+b*b-e*e-f*f))/(2*(e-a)*(b-d)-2*(c-a)*(b-f)); x=(2*(b-d)*y-a*a-b*b+c*c+d*d)/(2*(c-a)); }} } double r=(x-a)*(x-a)+(y-b)*(y-b); //cout<>X>>Y; if((x-X)*(x-X)+(y-Y)*(y-Y)<=r){cout<<"Yes"<