#include <vector>
#include <iostream>
#include <cassert>
#include <cmath>
#include <map>
#include <set>
using namespace std;
int main () {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int N, K;
cin >> N >> K;
int64_t arr[N];
for (int i = 0; i < N; i++) {
cin >> arr[i];
}
int64_t INF = 1e17;
vector<int64_t> prev(N + 1), cur(N + 1);
prev.assign(N + 1, INF), cur.assign(N + 1, INF);
for (int j = 1; j <= N; j++) {
prev[j] = ((j == 1) ? arr[0] : max(prev[j - 1], arr[j - 1]));
}
for (int i = 2; i <= K; i++) {
vector<pair<int,pair<int,int>>> ranges;
for (int j = 1; j <= N; j++) {
cur[j] = INF;
if (j == 1) {
cur[1] = prev[0] + arr[0];
ranges.push_back(make_pair(arr[0], make_pair(0, 0)));
} else {
while (!ranges.empty() and ranges.back().first <= arr[j - 1]) {
ranges.pop_back();
}
if (ranges.empty()) {
ranges.push_back(make_pair(arr[j - 1], make_pair(0, j - 1)));
} else {
ranges.push_back(make_pair(arr[j - 1], make_pair(ranges.back().second.second + 1, j - 1)));
}
for (auto& p: ranges) {
for (int x = p.second.first; x <= p.second.second; x++) {
cur[j] = min(cur[j], p.first + prev[x]);
}
}
}
}
swap(cur, prev);
}
cout << prev[N];
}
