#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
int n,k;
cin>>n>>k;
int s=1;
vector<int>v;
int w=0;
vector<int>a(n);
for(int i=0;i<n;i++){
int t;
cin>>t;
a[i]=t;
}
sort(a.begin(),a.end());
for(int i=0;i<n;i++){
if(a[i]>s){
int x=a[i]+1-s;
v.push_back(x);
w++;
}
s=a[i]+1;
}
sort(v.begin(),v.end());
for(int i=w-1;i>=0;i--){
if(k>1){
s=s-v[i];
k--;
}
}
cout<<s<<endl;
return 0;
}
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