#include<stdio.h>
FILE *A,*B;
int i,j,N,M,mac,st,s[400],spart,smax;
int main()
{
	A=fopen("flip.in","r");
	B=fopen("flip.out","w");
	fscanf(A,"%d",&N);
	fscanf(A,"%d",&M);
	for(i=1;i<=N;i++)
	{
		for(j=1;j<=M;j++)
		{
			fscanf(A,"%d",&mac);
			st=st+mac;
			s[i]=s[i]+mac;
			s[N+j]=s[N+j]+mac;
		}
	}
	for(i=1;i<=N;i++)
	{
		for(j=1;j<=M;j++)
		{
			spart=st-s[i]-s[i]-s[N+j]-s[N+j];
			if(smax<spart)
			{
				smax=spart;
			}
		}
	}
	fprintf(B,"%d",smax);
	fclose(A);
	fclose(B);
	
}