#include <bits/stdc++.h>
using namespace std;

double jl(int x1,int y1,int x2,int y2)
{
	int dis;
	dis=sqrt(abs((x2-x1))*abs((x2-x1))+abs((y2-y1))*abs((y2-y1)));
	return dis;
} 

int main()
{
	int x1,x2,x3,y1,y2,y3;
	cin>>x1>>y1>>x2>>y2>>x3>>y3;
	cout<<jl(x1,y1,x2,y2)+jl(x1,y1,x3,y3)+jl(x2,y2,x3,y3);
	return 0;
}