#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
 
typedef vector<unsigned> row;
 
int main()
  {
   unsigned W,H,N;
   cin>>W>>H>>N;
   vector<row> tb(H,row(W));
   while(N--)
     {
      unsigned w,h,z,sx,sy,zmax=0;
      cin>>w>>h>>z>>sx>>sy;
      w+=sx;
      h+=sy;
      for(unsigned y=sy;y<h;++y) for(unsigned x=sx;x<w;++x) zmax=max(zmax,tb[y][x]);
      zmax+=z;
      for(unsigned y=sy;y<h;++y) for(unsigned x=sx;x<w;++x) tb[y][x]=zmax;
     }
   unsigned zmax=0;  
   for(unsigned y=0;y<H;++y) for(unsigned x=0;x<W;++x) zmax=max(zmax,tb[y][x]);
   cout<<zmax<<endl;
   return 0;
  }
 

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NyA1IDQKNCAzIDIgMCAwCjMgMyAxIDMgMAo3IDEgMiAwIDMKMiAzIDMgMiAyCg==

7 5 4
4 3 2 0 0
3 3 1 3 0
7 1 2 0 3
2 3 3 2 2