#include <bits/stdc++.h>
using namespace std;
#define ll long long
void init_code() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
}
void always424() {
int N, K;
cin >> N >> K;
vector<int> T(N);
for (int i = 0; i < N; i++) {
cin >> T[i];
}
if (K >= N) {
int total_time = N;
cout << total_time << endl;
return;
}
vector<int> gaps;
for (int i = 1; i < N; i++) {
gaps.push_back(T[i] - (T[i - 1] + 1));
}
sort(gaps.begin(), gaps.end());
int total_time = N;
for (int i = 0; i < (N - K); i++) {
total_time += gaps[i];
}
cout << total_time << endl;
}
int main() {
init_code();
// int t;
// cin >> t;
// while (t--)
always424();
}
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