#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
using ll = long long;

int cnt[1001001];

int main(){
    int H, W; cin >> H >> W;
    vector A(H, vector<int>(W)); rep(i, H) rep(j, W) cin >> A[i][j];
    int R = 0, C = 0;
    rep(i, H){
        int sm = 0;
        rep(j, W) sm += A[i][j];
        R += sm % 2;
    }
    rep(j, W){
        int sm = 0;
        rep(i, H) sm += A[i][j];
        C += sm % 2;
    }
    cout << max(R, C) << endl;
}