#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
ll n,k,ans=0;
cin >> n>> k;
vector<ll> a(n),dif(n-1);
for(int i = 0;i<n;i++) cin >> a[i];
for(int i = 0;i<n-1;i++) dif[i] = a[i+1]-a[i];
sort(dif.begin(),dif.end());
for(int i =0;i<(n-k);i++)
{
ans+= dif[i]-1;
}
ans+=n;
cout << ans << endl;
}
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