#include<stdio.h>
#include<iostream>
#include<windows.h>
#pragma comment(lib,"winmm.lib")
using namespace std;
int j=0;
int go(int kc,int *Ac,int wc,int nc)
{
    if(kc>=j) return wc;
    if(kc<j)
    {
        if((kc+1)%5==0)
            return go(kc+nc,Ac,Ac[kc]+wc,nc);
        else
            return go(kc+1,Ac,Ac[kc]+wc,nc)>go(kc+nc,Ac,Ac[kc]+wc,nc)?go(kc+1,Ac,Ac[kc]+wc,nc):go(kc+nc,Ac,Ac[kc]+wc,nc);
    }
}
void main()
{
    int m,n;
    DWORD   t1,   t2;
    cin>>m>>n;
    int *A,i,w=0;
    A=new int [m*n];
    for(i=0;i<m*n;i++)
    {
        if(i!=0&&i%n==0)cout<<endl;
        cin>>A[i];
    }
    j=m*n;
    t1=timeGetTime();
    int max=go(0,A,w,n);
    cout<<max;
    t2=timeGetTime();
    cout<<"the time it takes:"<<t2-t1;
}

#include<stdio.h> 
int i,j,dp[16],n,m,v;    
void main(){    
    scanf("%d%d",&n,&m); 
    for(i=0;i<n;i++)    
         for(j=1;j<=m;j++){    
             scanf("%d",&v);    
             if(dp[j]<dp[j-1])dp[j] = dp[j-1];    
             dp[j]+= v>0?v:0;                                     
         }    
    printf("%d\n",dp[m]);  
}