#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	int H,W;
	cin>>H>>W;
	
	vector<vector<int>> A(H,vector<int>(W));
	
	vector<set<int>> Sh(500001),Sw(500001);
	
	rep(i,H){
		rep(j,W){
			cin>>A[i][j];
			
			Sh[A[i][j]].insert(i);
			Sw[A[i][j]].insert(j);
			
		}
	}
	
	int ans = 0;
	
	rep(i,Sh.size()){
		if(i==0)continue;
		ans += min((int)Sh[i].size(),(int)Sw[i].size());
	}
	
	cout<<ans<<endl;
	
    return 0;
}