#include <bits/stdc++.h>
#define int long long
#define MAXN 200001
using namespace std;
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n,k;
cin >> n >> k;
vector<int> t(n+1,0),v;
for(int i=1;i<=n;i++)cin >> t[i];
for(int i=2;i<=n;i++)v.push_back(t[i]-t[i-1]-1);
sort(v.begin(),v.end());
int ans=n;
for(int i=0;i<n-k;i++)ans+=v[i];
cout << ans << "\n";
return 0;
}
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