#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
vector< pair<int,int>>v;
signed main(){
int n,m;
cin>>n>>m;
vector< vector<int> > r(n+3,vector<int>(m+3)) ;
vector< vector<int> > u(n+3,vector<int>(m+3)) ;
vector<int> cr(m+2),vis(n+3);
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cin>>r[i][j];
}
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cin>>u[i][j];
}
}
int ans=0;
while(1){
bool c=0;
for(int i=1;i<=n;i++){
if(vis[i])continue;
bool ok=1;
for(int j=1;j<=m;j++){
if(cr[j]<r[i][j])ok=0;
}
if(ok){
for(int j=1;j<=n;j++){
cr[j]+=u[i][j];
}
vis[i]=1;
c=1;
ans++;
}
}
if(c==0)break;
}
cout<<ans;
}
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