#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(nullptr); cout.tie(nullptr);
int n, k, ans = 0;
cin >> n >> k;
vector<vector<int>> r(n + 1, vector<int> (k + 1, 0));
vector<vector<int>> v(n + 1, vector<int> (k + 1, 0));
vector<int> p(k + 1, 0);
for(int i = 1; i <= n; ++i){
for(int j = 1; j <= k; ++j){
cin >> r[i][j];
}
}
for(int i = 1; i <= n; ++i){
for(int j = 1; j <= k; ++j){
cin >> v[i][j];
}
}
assert(k == 1);
vector<pair<int, int>> vc;
for(int i = 1; i <= n; ++i) vc.push_back({r[i][1], v[i][1]});
sort(all(vc));
for(int i = 0; i < n; ++i){
if(vc[i].first <= p[0]){
p[0] += vc[i].second;
ans += 1;
}
}
cout << ans << "\n";
return 0;
}
