#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n, k;
cin >> n >> k;
vector<int> t(n);
for (int i = 0; i < n; i++) {
cin >> t[i];
}
vector<int> gaps;
for (int i = 0; i < n - 1; i++) {
gaps.push_back(t[i + 1] - t[i] - 1);
}
sort(gaps.rbegin(), gaps.rend());
int total = t[n - 1] - t[0] + 1;
for (int i = 0; i < min(k - 1, (int)gaps.size()); i++) {
total -= gaps[i];
}
cout << total << endl;
return 0;
}
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