#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
int k;
cin>>n>>k;
vector<int> t(n);
for(int i=0;i<n;i++) cin>>t[i];
sort(t.begin(),t.end());
int tong=n;
int doan=1;
vector<int> kc;
for(int i=1;i<n;i++){
int kcc=t[i]-t[i-1]-1;
if(kcc>0){
doan++;
kc.push_back(kcc);
}
}
if(doan<=k){
cout<<n;
return 0;
}
sort(kc.begin(),kc.end());
int gop=doan-k;
for(int i=0;i<gop;i++){
tong+=kc[i];
}
cout<<tong;
return 0;
}
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