#include<bits/stdc++.h>
using namespace std;
#define ll int
ll n,k,a[100005],d,sl;
vector<ll>vc;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
cin>>n>>k;
for(int i=1;i<=n;i++)
{
cin>>a[i];
d++;
}
sl=n;
for(int i=2;i<=n;i++)
vc.push_back(a[i]-(a[i-1]+1));
sort(vc.begin(),vc.end());
for(int i=0;i<vc.size();i++)
{
if(sl==k)
break;
d+=vc[i];
sl--;
}
cout<<d;
}
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