#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = 105;
int n, m, ans, r[N][N], u[N][N], a[N], v[N];
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> m;
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];
while(1){
bool f = 0;
for(int i = 1;i<=n;i++){
if(v[i]) continue;
bool ff = 1;
for(int j = 1;j<=m;j++){
if(a[j] < r[i][j]){
ff = 0;
}
}
if(ff){
f = 1;
for(int j = 1;j<=m;j++){
a[j] += u[i][j];
}
v[i] = 1;
break;
}
}
if(!f) break;
++ans;
}
cout << ans;
}
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