#include <bits/stdc++.h>

using i64 = long long;
using real = long double;

constexpr real eps = 1E-8;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int x[3], y[3];
    for (int i = 0; i < 3; i++) {
        std::cin >> x[i] >> y[i];
    }
    
    auto get = [&](const auto &f) {
        real lo = -1E4, hi = 1E4;
        while (hi - lo > 3 * eps) {
            real x1 = (lo + hi - eps) / 2;
            real x2 = (lo + hi + eps) / 2;
            if (f(x1) > f(x2)) {
                lo = x1;
            } else {
                hi = x2;
            }
        }
        return f((lo + hi) / 2);
    };
    
    std::cout << std::fixed << std::setprecision(10);
    std::cout << get([&](real px) {
        return get([&](real py) {
            real ans = 0;
            for (int i = 0; i < 3; i++) {
                ans += (i + 1) * std::hypot(px - x[i], py - y[i]);
            }
            return ans;
        });
    }) << "\n";
    
    return 0;
}