Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
	)

var scanner = bufio.NewScanner(os.Stdin)

const INF = 0x7FFFFFFF

var (
	direction1 = [][]int{ // 奇数段目の移動方向
		{-1, 0}, {1, 0}, {0, -1}, {0, 1}, {1, -1}, {1, 1},
	}
	direction2 = [][]int{ // 偶数段目の移動方向
		{-1, -1}, {0, -1}, {1, 0}, {0, 1}, {-1, 1}, {-1, 0},
	}
)

func main() {
	for scanner.Scan() {
		buf := strings.Split(scanner.Text(), " ")
		m, _ := strconv.Atoi(buf[0])
		n, _ := strconv.Atoi(buf[1])
		if m == 0 && n == 0 {
			break
		}
		// initialize district_map
		/*
			district_map = [
				[-1, -1,  -1,  -1,  -1]
				[-1, INF, INF, INF, -1]
				[-1, INF, INF, INF, -1]
				[-1, INF, INF, INF, -1]
				[-1, INF, INF, INF, -1]
				[-1, -1,  -1,  -1,  -1]
			]
		*/
		district_map := make([][]int, n+2)
		for i := range district_map {
			district_map[i] = make([]int, m+2)
		}
		tmp1 := make([]int, m+2)
		for i := range tmp1 {
			tmp1[i] = -1
		}
		district_map[0] = tmp1
		district_map[n+1] = tmp1
		for i := 1; i < n+1; i++ {
			district_map[i] = make([]int, m+2)
			district_map[i][0] = -1
			district_map[i][m+1] = -1
			for j := 1; j < m+1; j++ {
				district_map[i][j] = INF
			}
		}

		scanner.Scan()
		s, _ := strconv.Atoi(scanner.Text())
		for i := 0; i < s; i++ {
			scanner.Scan()
			buf_ := strings.Split(scanner.Text(), " ")
			x, _ := strconv.Atoi(buf_[0])
			y, _ := strconv.Atoi(buf_[1])
			Search(Point{x, y}, district_map, m, n)
		}
		ans := 0
		scanner.Scan()
		t, _ := strconv.Atoi(scanner.Text())
		for i := 0; i < t; i++ {
			scanner.Scan()
			buf__ := strings.Split(scanner.Text(), " ")
			x, _ := strconv.Atoi(buf__[0])
			y, _ := strconv.Atoi(buf__[1])
			z := Count(Point{x, y}, district_map, m, n)
			ans = max(ans, z)
		}
		fmt.Println(ans)
	}
}

func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}

type Point struct {
	x, y int
}

type Entry struct {
	hop   int
	point Point
}

func Search(p Point, mp [][]int, m, n int) {
	que := make([]Entry, 0)
	que = append(que, Entry{0, p})
	check := make([][]bool, n+2)
	for i := range check {
		check[i] = make([]bool, m+2)
	}
	check[p.y][p.x] = true
	mp[p.y][p.x] = 0
	var direction [][]int
	for len(que) > 0 {
		tmp := que[0]
		que = que[1:]
		dist, point := tmp.hop, tmp.point
		if point.y%2 == 0 {
			direction = direction1
		} else {
			direction = direction2
		}
		for _, d := range direction {
			nx, ny := point.x+d[0], point.y+d[1]
			if !check[ny][nx] && mp[ny][nx] != -1 {
				check[ny][nx] = true
				if mp[ny][nx] > dist+1 {
					mp[ny][nx] = dist + 1
				}
				que = append(que, Entry{dist + 1, Point{nx, ny}})
			}
		}
	}
}

func Count(p Point, mp [][]int, m, n int) int {
	que := make([]Entry, 0)
	que = append(que, Entry{0, p})
	check := make([][]bool, n+2)
	for i := range check {
		check[i] = make([]bool, m+2)
	}
	check[p.y][p.x] = true
	ans := 1
	var direction [][]int
	for len(que) > 0 {
		tmp := que[0]
		que = que[1:]
		dist, point := tmp.hop, tmp.point
		if point.y%2 == 0 {
			direction = direction1
		} else {
			direction = direction2
		}
		for _, d := range direction {
			nx, ny := point.x+d[0], point.y+d[1]
			if !check[ny][nx] && mp[ny][nx] != -1 {
				check[ny][nx] = true
				if mp[ny][nx] > dist+1 {
					ans++
				}
				que = append(que, Entry{dist + 1, Point{nx, ny}})
			}
		}
	}
	return ans
}

C++: #include <iostream>
#include <cstdio>
#include <iomanip>

#include <vector>
#include <map>
#include <set>
#include <queue>
#include <bitset>
#include <stack>
#include <utility>

#include <numeric>
#include <algorithm>
#include <functional>

#include <cctype>

#include <complex>
#include <string>
#include <sstream>

using namespace std;

#define all(c) c.begin(),c.end()
#define rall(c) c.rbegin(),c.rend()
#define rep(i,n) for(int i=0;i<(n);i++)
#define tr(it,container) for(typeof(container.begin()) it = container.begin(); \
                                                  it != container.end(); ++it)
#define mp(a,b) make_pair((a),(b))

typedef long long ll;
typedef complex<double> P;
const int dx[] = {1,0,-1,0};
const int dy[] = {0,-1,0,1};
const double EPS = 1e-9;
const int days[] = {31,28,31,30,31,30,31,31,30,31,30,31};
const int daysleap[] = {31,29,31,30,31,30,31,31,30,31,30,31};

const int ddx1[] = {0,-1,0,1,1,1};
const int ddy1[] = {-1,0,1,1,0,-1};
const int ddx0[] = {-1,-1,-1,0,1,0};
const int ddy0[] = {-1,0,1,1,0,-1};

int main(){
    while(true){
        int m,n,s;
        cin >> m;
        if(m==0)break;
        cin >> n >> s;
        vector<pair<int,int> > V(s);

        rep(i,s){
            int x,y;
            cin >> x >> y;
            x--;y--;
            V[i] = mp(x,y);
        }
        vector<vector<int> > depth(n,vector<int>(m,10000));
        //x,y,depth
        queue<pair<pair<int,int>,int> > Q;
        rep(i,s){
            Q.push(mp(V[i],0));
        }
        while(!Q.empty()){
            pair<pair<int,int>,int> p = Q.front();
            int x = p.first.first;int y = p.first.second;
            int d = p.second;
            Q.pop();
            if(depth[y][x] <= d) continue;
            depth[y][x] = d;
            for(int i=0;i<6;i++){
                int newx,newy;
                if(y % 2 == 0){
                    newx = x + ddx0[i];
                    newy = y + ddy0[i];
                }else{
                    newx = x + ddx1[i];
                    newy = y + ddy1[i];
                }
                if(newx == -1 || newy == -1 || newx == m || newy == n){
                    continue;
                }
                Q.push(mp(mp(newx,newy),d+1));
            }
        }

        int t;
        cin >> t;
        vector<pair<int,int> > Con(t);
        rep(i,t){
            int p,q;
            cin >> p >> q;
            p--;q--;
            Con[i] = mp(p,q);
        }
        int maxcnt = -1;

/*
        rep(i,n){
            rep(j,m){
                cerr << depth[i][j] << " ";
            }
            cerr << endl;
        }
*/
        rep(cont,t){
            pair<int,int> cc = Con[cont];
            int cnt = 0;
            queue<pair<pair<int,int>,int> > Qc;
            Qc.push(mp(cc,0));
            vector<vector<int> > depthc = depth;
            while(!Qc.empty()){
                pair<pair<int,int>,int> p = Qc.front();
                int x = p.first.first;int y = p.first.second;
                int d = p.second;
                Qc.pop();
                if(depthc[y][x] <= d) continue;

                depthc[y][x] = d;
                cnt++;
                for(int i=0;i<6;i++){
                    int newx,newy;
                    if(y % 2 == 0){
                        newx = x + ddx0[i];
                        newy = y + ddy0[i];
                    }else{
                        newx = x + ddx1[i];
                        newy = y + ddy1[i];
                    }

                    if(newx == 0 || newy == 0 || newx == m || newy == n){
                        continue;
                    }
                    Qc.push(mp(mp(newx,newy),d+1));
                }
            }
            maxcnt = max(maxcnt,cnt);
        }
        cout << maxcnt << endl;
    }
    return 0;
}