#include<bits/stdc++.h>
#define LL long long 
#define int long long
#define orz cout << "tyy YYDS!!!\n"
using namespace std;
const int MAXN = 2e5 + 10;
const int INF = 1e9 + 7;
const int mod = 998244353;

int read() {
	int s = 0, f = 0; char ch = getchar();
	while(!isdigit(ch)) f |= (ch == '-'), ch = getchar();
	while(isdigit(ch)) s = (s << 1) + (s << 3) + (ch ^ 48), ch = getchar();
	return f ? -s : s;
}

int n, m;
double ans, res;
double x[MAXN], y[MAXN];

double Calc(int i, int j) {
	return sqrt((x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]));
}

signed main() {
	n = read();
	for(int i = 1; i <= 3; ++i) cin >> x[i] >> y[i];
	ans = max(Calc(1, 2), max(Calc(2, 3), Calc(1, 3)));
	m = read();
	for(int i = 1; i <= 3; ++i) cin >> x[i] >> y[i];
	res = max(Calc(1, 2), max(Calc(2, 3), Calc(1, 3)));
//	cout << ans << " " << res << "\n";
//	cout << Calc(1, 2) << " " << Calc(2, 3) << " " << Calc(1, 3) << "\n";
	printf("%.6lf\n", min(ans, res));
	return 0;
}