#include <bits/stdc++.h>
using namespace std;

int main() {
  int h, w;
  cin >> h >> w;
  
  vector<vector<int>> vv(h, vector<int>(w));
  vector<vector<int>> vi(500001, vector<int>(0));
  vector<vector<int>> vj(500001, vector<int>(0));
  
  
  for (int i = 0; i < h; i++) {
    for (int j = 0; j < w; j++) {
      int x;
      cin >> x;
      vv.at(i).at(j) = x;
      vi.at(x).push_back(i + 1);
    }
  }
  
  for (int i = 0; i < w; i++) {
    for (int j = 0; j < h; j++) {
      int y = vv.at(j).at(i);
      vj.at(y).push_back(i + 1);
    }
  }
  
  
  int count = 0;
  
  for (int i = 1; i < vi.size(); i++) {
    int vs = vi.at(i).size();
    
    if (vs == 0) {      
      continue;
    }
    
    else if (vs == 1) {
      count++;
    }
    
    else {
      int icount = 0;
      int jcount = 0;
      int pre_m = 0;
      int pre_n = 0;
      
      for (int m : vi.at(i)) {
        if (m != pre_m) {
          icount++;
          pre_m = m;
        }
      }
      for (int n : vj.at(i)) {
        if (n != pre_n) {
          jcount++;
          pre_n = n;
        }
      }
      count += min(icount, jcount);
    }
  }
  cout << count << endl;
}