#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pii=pair<ll,ll>;
int main(){
cin.tie(0)->sync_with_stdio(0);
int n,k,L,D,sum;cin>>n>>k>>L;
D=L;
vector<int> a;
for(int i=1;i<n;i++){
int x;cin>>x;
a.push_back(x-L-1);
L=x;
if(i==n-1) sum=x-D+1;
}
sort(a.begin(),a.end(),greater<int>());
k--;
for(int i=0;i<n-1&&k>0;k--,i++) sum-=a[i];
cout<<sum;
}
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