// Born_To_Laugh - Hughie Do
#include <bits/stdc++.h>
#define alle(sth) sth.begin(), sth.end()
using namespace std;
typedef long long ll;
[[maybe_unused]] const ll MOD = 998244353, INF = 1e18 + 7;
#define int ll
void solve(){
int n, k;cin >> n >> k;
vector<int> a(n+1, 0);
for(int i=1; i<=n; ++i)cin >> a[i];
vector<vector<int>> dp(n+1, vector<int> (k+1, INF));
dp[0][0] = 0;
for(int i=1; i<=n; ++i){
for(int j=1; j<=k; ++j){
dp[i][j] = min({
dp[i-1][j] + a[i] - a[i-1],
dp[i-1][j-1] + 1
});
}
}
int ans = INF;
for(int j=1; j<=k; ++j){
ans = min(ans, dp[n][j]);
}
cout << ans << '\n';
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
solve();
}
