#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


int main(){
  int H, W;
  cin >> H >> W;
  vector<string> v(H+2, string(W+2, '*'));
  rep(i,H){
    string str;
    cin >> str;
    rep(j,W){
      v[i+1][j+1] = str[j];
    }
  }

  double ret = 1e18;
  rep(i,H+2){
    rep(j,W+2){
      if(v[i][j]=='*'){
        double dist = 0;
        rep(a,H+2){
          rep(b,W+2){
            if(v[a][b] == '*') continue;
            if(v[a][b] == '0') continue;
            dist += sqrt( (double)(a-i)*(a-i) + (double)(b-j)*(b-j) );
          }
        }
        ret = min(ret, dist);
      }
    }
  }
                   
  printf("%.12lf\n", ret);
                   
  return 0;
}