#include <bits/stdc++.h>
int main() {
using namespace std;
ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
int N, K; cin >> N >> K;
vector<array<int64_t, 2>> A(N);
for (auto &a : A) cin >> a[0];
for (auto &a : A) cin >> a[1];
sort(A.begin(), A.end());
int64_t P = 0, cnt = 0;
for (auto &a : A) {
if (a[0] > P)
break;
P += a[1];
cnt++;
}
cout << cnt;
return 0;
}
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