#include <bits/stdc++.h>
using namespace std;
vector<int> v;
int main(){
int a,b,x;
cin>>a>>b;
int arr[a];
int sum=0;
for (int i = 0; i < a; ++i)
{
cin>>x;
arr[i]=x;
}
for (int i = 1; i <a ; ++i) v.push_back(arr[i]-arr[i-1]-1);
sort(v.begin(),v.end());
x=a-b;
for (int i = 0; i < x; ++i)
{
sum+=v[i];
}
sum+=a;
cout<<sum;
return 0;
}
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