#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < n; i++)
#define rep2(i, x, n) for(int i = x; i <= n; i++)
#define rep3(i, x, n) for(int i = x; i >= n; i--)
#define each(e, v) for(auto &e: v)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)x.size()
using ll = long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
const int MOD = 1000000007;
//const int MOD = 998244353;
const int inf = (1<<30)-1;
const ll INF = (1LL<<60)-1;
template<typename T> bool chmax(T &x, const T &y) {return (x < y)? (x = y, true) : false;};
template<typename T> bool chmin(T &x, const T &y) {return (x > y)? (x = y, true) : false;};

struct io_setup{
    io_setup(){
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        cout << fixed << setprecision(15);
    }
} io_setup;

int main(){
    int H, W; cin >> H >> W;

    vector<vector<int>> A(H, vector<int>(W));
    rep(i, H){
        rep(j, W){
            cin >> A[i][j];
        }
    }

    int MAX = 500000;

    vector<vector<pii>> ps(MAX+1);

    rep(i, H){
        rep(j, W){
            ps[A[i][j]].eb(i, j);
        }
    }

    vector<int> cx(H, 0), cy(W, 0);
    int sx = 0, sy = 0;

    ll ans = 0;

    rep3(i, MAX, 1){
        each(e, ps[i]){
            auto [x, y] = e;
            if(cx[x]++ == 0) sx++;
            if(cy[y]++ == 0) sy++;
        }

        ans += min(sx, sy);
        sx = 0, sy = 0;

        each(e, ps[i]){
            auto [x, y] = e;
            cx[x]--, cy[y]--;
        }
    }

    cout << ans << '\n';
}