#include
#include
#include
using namespace std;
template
inline void read(T&x)
{
x=0;
char s=getchar();
bool f=false;
while(!(s>='0'&&s<='9'))
{
if(s=='-')
f=true;
s=getchar();
}
while(s>='0'&&s<='9')
{
x=(x<<1)+(x<<3)+s-'0';
s=getchar();
}
if(f)
x=(~x)+1;
return;
}
#define re register
#define temperature 1e5
#define cold 0.996
const int N=1e3+10;
int numOfWeights;
double ans, ansX, ansY;
struct node
{
int x, y, w;
} weights[N];
inline double calculatePotentialEnergy(double x, double y)//计算势能，势能越小解越优
{
double energy=0.0;
for(re int i=1; i<=numOfWeights; i++)
energy+=sqrt((x-weights[i].x)(x-weights[i].x)+(y-weights[i].y)(y-weights[i].y))*weights[i].w;
return energy;
}
inline void solve()
{
double t=temperature;
while(t>1e-18)
{
double tmpX=ansX+(rand()+rand()-RAND_MAX)*t,tmpY=ansY+(rand()+rand()-RAND_MAX)*t;
double tmp=calculatePotentialEnergy(tmpX,tmpY);
double d=tmp-ans;
if(d<0.0)
ans=tmp,ansX=tmpX,ansY=tmpY;
else if(exp(-d/t)RAND_MAX>rand())
ansX=tmpX,ansY=tmpY;
t=cold;
}
}
int main()
{
srand(rand());
read(numOfWeights);
for(re int i=1; i<=numOfWeights; i++)
{
read(weights[i].x),read(weights[i].y),read(weights[i].w);
ansX+=weights[i].x;
ansY+=weights[i].y;
}
ansX/=numOfWeights,ansY/=numOfWeights,ans=calculatePotentialEnergy(ansX,ansY);//乱搞一个初始值
for(re int i=1; i<=4; i++)//多搞几次
solve();
printf("%.3lf %.3lf\n",ansX,ansY);
return 0;
