#include <vector>
#include <iostream>
#include <cassert>
#include <cmath>
#include <map>
#include <set>
#include <stack>
using namespace std;
const int64_t INF = 1e17;
struct Stack {
vector<pair<int64_t, int64_t>> st; //[value, previous min]
int64_t mn;
Stack() {
this->mn = INF;
}
void add(int64_t x) {
st.push_back(make_pair(x, mn));
mn = min(mn, x);
}
void pop() {
mn = st.back().second;
st.pop_back();
}
};
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];
}
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<pair<int64_t,int64_t>,pair<int64_t,int64_t>>> ranges;
Stack st;
for (int j = 1; j <= N; j++) {
cur[j] = INF;
if (j == 1) {
cur[1] = prev[0] + arr[0];
st.add(arr[0] + prev[0]);
ranges.push_back(make_pair(make_pair(arr[0], prev[0]), make_pair(0, 0)));
} else {
int64_t mn = prev[j - 1];
while (!ranges.empty() and ranges.back().first.first <= arr[j - 1]) {
mn = min(mn, ranges.back().first.second);
ranges.pop_back();
st.pop();
}
if (ranges.empty()) {
ranges.push_back(make_pair(make_pair(arr[j - 1], mn), make_pair(0, j - 1)));
st.add(arr[j - 1] + mn);
} else {
ranges.push_back(make_pair(make_pair(arr[j - 1], mn), make_pair(ranges.back().second.second + 1, j - 1)));
st.add(arr[j - 1] + mn);
}
cur[j] = st.mn;
}
}
swap(cur, prev);
}
cout << prev[N];
}
