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- #include <bits/stdc++.h>
- using namespace std;
- int main() {
- int k, n;
- cin >> k >> n;
- int a[n], b[n];
- for(int i = 0; i < n; i++) {
- cin >> a[i];
- }
- for(int i = 0; i < n; i++) {
- cin >> b[i];
- }
- vector<int> cnt1(101, 0), cnt2(101, 0);
- for(int i = 0; i < n; i++) {
- cnt1[a[i]]++;
- cnt2[b[i]]++;
- }
- long long res = 0;
- for(int i = 0; i <= 100; i++) {
- long long c = 0;
- for(int j = 0; j <= 100; j++) {
- if(i + j >= k) {
- c += cnt2[j];
- }
- }
- res += c * cnt1[i];
- }
- cout << res << endl;
- return 0;
- }
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