#include <bits/stdc++.h>
using namespace std;
int main()
{
int N,K; cin >> N >> K;
vector<long long>guests(N);
for (int i = 0; i < N; i++) cin >> guests[i];
vector<long long>gaps;
for (int i = 0; i < N - 1; i++)
{
int gap = guests[i + 1] - guests[i];
gaps.push_back(gap);
}
sort(gaps.begin(),gaps.end());
int total = K;
for (int i = 0; i < N - K; i++)
{
total += gaps[i];
}
cout << total << endl;
}
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