#include <fstream>

using namespace std;

int main(){
	int N, M, i, j, tabla[16][16], S=0, aux[2], c;
	ifstream input("flip.in");
	ofstream output("flip.out");
	input>>N>>M;
	for(i=1;i<=N;i++){
		for(j=1;j<=M;j++){
			input>>tabla[N][M];}}
	
	for(i=1;i<=N;i++){
		aux[1]=0;
		aux[2]=0;
		for(c=1;c<=2;c++){
			for(j=1;j<=M;j++){
				if(c==2){aux[1]=aux[1]+tabla[N][M]*-1;}else{aux[2]=aux[2]+tabla[N][M];}}}
		if(aux[1]>aux[2]){S=S+aux[1];}else{S=S+aux[2];}}
    output<<S;
	return 0;}