#include <bits/stdc++.h>   using namespace std;   void task();   int main() {     task();     return 0;   }   const int N = 2e5 + 10;   const long long int MOD = (long long int)1e9 + 7;   const int INF = 0x3f3f3f3f;   const long long int LINF = (long long int)4e18 + 100;   const int BUF_SIZE = (int)1e6 + 10;   const double PI = acos(-1);   pair<int, int> a[N];   double u[N], ad[N], bd[N];   long long int sq_dist(long long int x1, long long int y1, long long int x2,                         long long int y2) {     return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);   }   double dist(long long int x1, long long int y1, long long int x2,               long long int y2) {     return sqrt(sq_dist(x1, y1, x2, y2));   }   double dp[N][2][2];   void task() {     int ai, aj, bi, bj, ui, uj;     cin >> ai >> aj >> bi >> bj >> ui >> uj;     int n;     cin >> n;     for (int i = 0; i < n; ++i) {       cin >> a[i].first >> a[i].second;     }     for (int i = 0; i < n; ++i) {       u[i] = dist(ui, uj, a[i].first, a[i].second);       (void(1));       ;     }     for (int i = 0; i < n; ++i) {       ad[i] = dist(ai, aj, a[i].first, a[i].second) + u[i];       (void(1));       ;     }     for (int i = 0; i < n; ++i) {       bd[i] = dist(bi, bj, a[i].first, a[i].second) + u[i];       (void(1));       ;     }     fill(dp[0][0], dp[0][0] + N * 2 * 2, LINF);     dp[0][1][1] = 0;     for (int i = 0; i < n; ++i) {       for (int j = 0; j < 2; ++j) {         for (int k = 0; k < 2; ++k) {           (void(1));           ;           if (j == 1) {             dp[i + 1][j - 1][k] = min(dp[i][j][k] + ad[i], dp[i + 1][j - 1][k]);           }           if (k == 1) {             dp[i + 1][j][k - 1] = min(dp[i][j][k] + bd[i], dp[i + 1][j][k - 1]);           }           dp[i + 1][j][k] = min(dp[i + 1][j][k], dp[i][j][k] + 2 * u[i]);         }       }     }     double ans = LINF;     for (int i = 0; i < 2; ++i) {       for (int j = 0; j < 2; ++j)         if (!(i == 1 && j == 1)) {           (void(1));           ;           ans = min(ans, dp[n][i][j]);         }     }     cout << fixed << setprecision(12) << ans;   }   