#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001LL

int main(){
	
	int h,w;
	cin>>h>>w;
	int X = 0,Y = 0;
	vector<vector<int>> a(h,vector<int>(w));
	rep(i,h){
		rep(j,w){
			cin>>a[i][j];
		}
	}
	rep(i,h){
		int c = 0;
		rep(j,w)c ^= a[i][j];
		X += c;
	}
	rep(i,w){
		int c = 0;
		rep(j,h)c ^= a[j][i];
		Y += c;
	}
	cout<<max(X,Y)<<endl;
		
	return 0;
}