#include <bits/stdc++.h>
using namespace std;
signed main() {
ios::sync_with_stdio(0);
cin.tie(nullptr);
int n, k;
cin >> n >> k;
vector<int> t(n);
for (int &i : t) {
cin >> i;
}
vector<int> diff;
for (int i = 1; i < n; i++) {
diff.push_back(t[i] - t[i - 1] - 1);
}
sort(diff.begin(), diff.end());
k = n - k;
int res = n;
for (int i = 0; i < k; i++) {
res += diff[i];
}
cout << res << '\n';
}
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