#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream cin("traseu.in");
    ofstream cout("traseu.out");
    int n,i,a,b,c,m,j,maxx=0,sum1=0,sum2=0,sum3=0;
    cin>>n>>m;
    for(i=0;i<n;i++)
    {
        for(j=1;j<=m;j++)
        {
            cin>>a>>b>>c;
            while(a)
            {
                sum1+=a;
            }
            while(b)
            {
                sum2+=b;
            }
            while(c)
            {
                sum3+=c;
            }
        }
    }
    if(sum1>maxx)
        maxx=sum1;
    else if(sum2>maxx)
        maxx=sum2;
    else if(sum3>maxx)
        maxx=sum3;
    cout<<maxx;
    return 0;
}