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

int main()
{   
    int N, M; cin >> N >> M;
    long A[400][400];
    REP(i, N) REP(j, M) cin >> A[i][j];
    long S[400], V[400];
    REP(i, M) S[i] = 0l;
    REP(i, M) REP(j, N) S[i] += A[j][i];
    REP(i, N) V[i] = 0l;
    REP(i, N) REP(j, M) V[i] += A[i][j] * S[j];
    sort(V, V+N);
    long ans = 0l;
    REP(i, N/2) ans += (V[2*i+1] - V[2*i]);
    cout << ans << endl;
    return 0;
}