#include <bits/stdc++.h>
using namespace std;

void solve() {
    int H, W;
    cin >> H >> W;
    vector<vector<int>> A(H, vector<int>(W));
    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            cin >> A[i][j];
        }
    }
    int r = 0, c = 0;
    for (int i = 0; i < H; i++) {
        int sum = 0;
        for (int j = 0; j < W; j++) {
            sum += A[i][j];
        }
        if (sum % 2 == 1) {
            r++;
        }
    }
    for (int i = 0; i < W; i++) {
        int sum = 0;
        for (int j = 0; j < H; j++) {
            sum += A[j][i];
        }
        if (sum % 2 == 1) {
            c++;
        }
    }
    cout << max(r, c) << endl;
}

int main() {
    solve();
    return 0;
}