#include <bits/stdc++.h>
using namespace std;
#define int int64_t
int32_t main() {
int n, k;
cin >> n >> k;
if (n == 1) {
cout << k;
return 0;
}
vector<int> a(n);
for (int i = 0; i < n; i++) {
cin >> a[i];
}
int ans = a.back() - a[0] + 1;
vector<int> diff;
for (int i = 1; i < n; i++) {
diff.push_back(a[i] - a[i - 1] - 1);
}
sort(diff.begin(), diff.end());
for (int i = diff.size() - 1; i >= diff.size() - k + 1; i--) {
ans -= diff[i];
}
cout << ans;
return 0;
}
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