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

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 cnth=0,cntw=0;
    rep(i,h){
        int cnt=0;
        rep(j,w){
            cnt+=a[i][j];
        }
        cnth+=cnt%2;
    }
    rep(i,w){
        int cnt=0;
        rep(j,h){
            cnt+=a[j][i];
        }
        cntw+=cnt%2;
    }
    cout << max(cnth,cntw) << endl;
    return 0;
}