// Om Namah Shivaya
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl
#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)
template<typename T>
void amin(T &a, T b) {
a = min(a, b);
}
template<typename T>
void amax(T &a, T b) {
a = max(a, b);
}
#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif
/*
*/
const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
void solve(int test_case)
{
ll n, k; cin >> n >> k;
vector<ll> a(n + 5);
rep1(i, n) cin >> a[i];
a[0] = inf2;
vector<ll> dp1(n + 5, inf2);
dp1[0] = 0;
rep1(t, k) {
vector<ll> dp2(n + 5, inf2);
stack<array<ll, 3>> st;
// (j,rangemn,prefmn)
st.push({0, inf2, inf2});
rep1(i, n) {
ll mn = inf2;
while (true) {
auto [j, mndp, mnval] = st.top();
if (a[j] > a[i]) break;
amin(mn, mndp);
amin(mn, dp1[j]);
st.pop();
}
{
auto [j, mndp, mnval] = st.top();
amin(mn, dp1[j]);
ll val = a[i] + mn;
amin(mnval, val);
dp2[i] = mnval;
st.push({i, mn, mnval});
}
}
dp1 = dp2;
}
ll ans = dp1[n];
cout << ans << endl;
}
int main()
{
fastio;
int t = 1;
// cin >> t;
rep1(i, t) {
solve(i);
}
return 0;
}
