#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(NULL);
int s,y;
cin>>s>>y;
vector<long long>z(s);
for(int i=0;i<s;i++)cin>>z[i];
vector<pair<long long,long long>>a;
for(int i=0;i<s;i++)a.push_back({z[i],z[i]+1});
vector<long long>f;
for(int i=1;i<s;i++)f.push_back(a[i].first-a[i-1].second);
sort(f.begin(),f.end());
long long t=0;
for(int i=0;i<s;i++)t+=a[i].second-a[i].first;
int b=s-y;
for(int i=0;i<b;i++)t+=f[i];
cout<<t;
}
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