#include <bits/stdc++.h>
using namespace std;
#define int long long
int32_t main() {
int n, k;
cin >> n >> k;
int guests[n];
multiset<int> st;
for(int i=0; i<n; ++i) cin >> guests[i];
for(int i=1; i<n; ++i) st.insert(guests[i]-guests[i-1]-1);
//for(auto elem: st) cout << elem << " ";
int ans=n;
while(n>k && !st.empty()) {
ans+=*st.begin();
st.erase(st.begin());
n--;
//cout << n;
}
cout << ans;
return 0;
}
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