#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
#define fast ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0)
#define exit return 0
#define cap pair<int,int>
#define fi first
#define se second
#define pb push_back
#define FOR(i,l,r) for(int i=l;i<=r;i++)
#define FOD(i,r,l) for(int i=r;i>=l;i--)
#define fill(f,x) memset(f,x,sizeof(f))
#define lcm(a,b) (a/__gcd(a,b)*b)
#define TIME 1.0 * clock() / CLOCKS_PER_SEC
int F[105][100005];
int A[1000005];
signed main()
{
fast;
int n,k;
cin>>n>>k;
FOR(i,0,n) FOR(j,0,k) F[j][i]=1e18;
F[0][0]=0;
FOR(i,1,n) cin>>A[i];
// for (int i = 1; i <= n; ++i) F[1][i] = max(F[1][i - 1], A[i]);
FOR(i,1,k)
{
deque<cap> q;
FOR(j,1,n)
{
int minf=F[i-1][j-1];
while(q.size() && A[q.back().second]<=A[j])
{
minf=min(minf,q.back().first);
q.pop_back();
}
if(q.size()) F[i][j]=min(F[i][q.back().second],minf+A[j]);
else F[i][j]=minf+A[j];
q.push_back({minf,j});
}
}
cout<<F[k][n];
exit;
}
/*
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*/
