#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
int n, k;
cin >> n >> k;
vector<int> v(n), d;
for (auto &i : v)
cin >> i;
for (int i = 0; i < n - 1; i++)
d.push_back(v[i + 1] - v[i] - 1);
sort(d.begin(), d.end());
int ans = n;
for (int i = 0; i < n - k; i++)
ans += d[i];
cout << ans;
return 0;
}
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