#include <bits/stdc++.h>
using namespace std;
int n, m, b;
int a[1000];
int dp[1005];

int main() {
	cin >> n >> m;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	b = 1;
	for (int i = 1; i <= n; i++) {
		for (int j = m; j > 0; j--) {
			if (b != a[i]) {
				if (dp[j - 1] + 1 > dp[j]) {
					dp[j] = dp[j - 1] + 1;
					b = a[i];
				}
			} else
				dp[j] += 1;
		}
	}
	cout << dp[m];
	return 0;
}