#include <bits/stdc++.h>
using namespace std;
int main() {
// subtask 1
ios_base::sync_with_stdio(0);
cin.tie(NULL);
int n, k;
cin >> n >> k;
vector<int> a(n);
for (int i = 0; i < n; i++) cin >> a[i];
for (int i = 1; i < n; i++) {
int p;
cin >> p;
}
vector<int> freq(k);
int ans = 0;
for (int i = n-1; i >= 0; i--) {
freq[a[i]]++;
ans = max(ans, freq[a[i]]);
}
cout << ans << ' ' << '\n';
return 0;
}
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