#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
// freopen("input","r",stdin);
// freopen("output","w",stdout);
int n,k;
cin >> n >> k;
int a, total =1;
vector<int> v;
for(int i=1; i<=n;i++){
int b;
cin >> b;
if(i>1){
v.push_back(b-a-1);
total += b-a;
}
a=b;
}
sort(v.rbegin(),v.rend());
for(int i=0;i<n-k;i++){
total -= v[i];
}
cout << total << endl;
return 0;
}
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