/**
 * author: said_v15
**/

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
//#include <__msvc_all_public_headers.hpp>
 
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
 
typedef long long  ll;

#define press_F_to_pay_respect ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define forn for(int i=0;i<n;i++) 
#define fore(i,a,b) for(int i = a; i < (b); i++)
#define pb push_back 
#define pob pop_back()
#define mp make_pair 
#define sc second 
#define f first 
#define th third
#define ld long double
#define kek cout<<"\n"; 
#define rep(i,a,b) for(int i=a;i<b;i++)
#define all(v) ((v).begin()), ((v).end()) 
#define halt {cout<<"NO"; return 0;}


const ll MOD = 1e9 + 7;
const ll MOD1 = 998244353;
const int MAXN = 2000100;
const int INF = 1e8;
const ll LL_INF=1e18;
const double pi=3.1415926535;
using namespace std;
int divide(int a, int b)
{
          return (a+b-1)/b;
}

int main()
{
    #if defined(_DEBUG)
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
    #endif
 press_F_to_pay_respect;
 // cout << fixed << setprecision(12) << ans;
 // string al = "abcdefghijklmnopqrstuvwxyz";
 int questions=1;
 // cin>>questions;
 while(questions--)
 {
    int n,m;
    cin>>n>>m;
    ll ans=0;
    forn
    {
              ll cnt=0;
              for(int j=0;j<m;j++) 
              {
                        int a;
                        cin>>a;
                        cnt+=a;
              }
              ans=max(ans,  cnt) ;
    }
    cout<<ans;
    kek;
    
  
  
  
          
 }
 
 
 // !!! LOOK AT NUMBER OF QUESTIONS IN A PROBLEM !!! (cin>>questions)
 
 
 
  // cout <<"Runtime is:"<<clock() * 1.0 / CLOCKS_PER_SEC <<endl;
   return 0;
   
   
 
}