//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//  MMMMMMMMMMMMMMMMNOtXtdMMMMMNxzZMMNmgHyVVVVVW%..?/(.,(x-..........(HfffpffpffpffWHHffpffppfVyyWMMMMMM


//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

int main() {

    while (true) {

        int R, C;
        cin >> R >> C;

        if (!(R | C)) break;

        vector<vector<int>> a(R, vector<int>(C));
        for (int i = 0; i < R; i++) for (int j = 0; j < C; j++) cin >> a[i][j];

        int ans = 0;
        for (int bit = 0; bit < (1 << R); bit++) {
            int sum = 0;
            for (int j = 0; j < C; j++) {
                int d = 0;
                for (int i = 0; i < R; i++) {
                    if (bit & (1 << i)) {
                        d += a[i][j] == 1;
                    } else {
                        d += a[i][j] == 0;
                    }
                }
                sum += max(d, R - d);
            }
            ans = max(ans, sum);
        }

        cout << ans << endl;

    }

    return 0;
}






































Measured memory_bytes: 3280