#include <bits/stdc++.h>
#define ll long long
#define fi(i,a,b) for(int i=a; i<=b; i++)
#define fid(i,a,b) for(int i=a; i>=b; i--)
#define VanLoi ""
#define gb(i, j) ((i >> j) & 1)
#define MOD 1000000007
#define N 1000005
using namespace std;
int n, k, a[N], f[105][N], top;
struct pii {
int F, S;
} q[N];
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n >> k;
fi(i, 1, k)
fi(j, 0, n) f[i][j] = 1e9;
f[1][0] = 0;
fi(i, 1, n) cin >> a[i], f[1][i] = max(f[1][i - 1], a[i]);
f[1][0] = 1e9;
fi(i, 2, k) {
top = 0;
q[0].S = 0;
fi(j, 1, n) {
int res = f[i - 1][j - 1];
while (top && a[q[top].S] <= a[j]) {
res = min(res, q[top].F);
top--;
}
f[i][j] = min(f[i][q[top].S], res + a[j]);
q[++top] = {res, j};
}
}
cout << f[k][n];
return 0;
}
