#include <cstdio>#include <cstring>#include <algorithm>#include <climits>#include <string>#include <iostream>#include <map>#include <cstdlib>#include <list>#include <set>#include <queue>#include <stack>#include <math.h>using namespace std;typedef long long LL;const int INF = 0xfffffff;int ret[100][100];int dp[13][1 << 12];int ans;int abs(int x){    return x>0 ? x : -x;}int gao(int x, int state){    if (state == 0 && x == 0) return 0;    if (~dp[x][state]) return dp[x][state];    int sum = INF;    for (int i = 0; i<ans; i++){        if (state&(1 << i)){            sum = min(sum, gao(i, state ^ (1 << i)) + ret[x][i]);        }    }    return dp[x][state] = sum;}int main(){    int n, m;    int Hash[100][100];    int Map[100][100];    while (cin >> n >> m){        memset(dp, -1, sizeof(dp));        ans = 1;        memset(Hash, 0, sizeof(Hash));        memset(ret, 0, sizeof(ret));        for (int i = 0; i<n; i++){            for (int j = 0; j<m; j++){                scanf("%d", &Map[i][j]);                if (i == 0 && j == 0) continue;                if (Map[i][j]){                    Hash[i][j] = ans++;                    ret[0][ans - 1] = ret[ans - 1][0] = i + j;                }            }        }        if (ans == 1 && Map[0][0]){            printf("%d\n", 0);            continue;        }        for (int i = 0; i<n; i++){            for (int j = 0; j<m; j++){                for (int k = 0; k<n; k++)                for (int l = 0; l<m; l++){                    if (Hash[i][j] && Hash[k][l]){                        ret[Hash[k][l]][Hash[i][j]] = ret[Hash[i][j]][Hash[k][l]] = abs(i - k) + abs(j - l);                    }                }            }        }        int k = gao(0, (1 << ans) - 1);        printf("%d\n", k);    }    return 0;}