#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#define int long long
int32_t main(){
int n = 0, k = 0;
cin >> n >> k;
k--;
int dizi[n];
int cevap = n;
vector <int> bosluklar;
for(int i = 0; i < n; i++){
cin >> dizi[i];
}
for(int i = 0; i < n - 1; i++){
bosluklar.push_back(dizi[i + 1] - (dizi[i] + 1));
}
sort(bosluklar.begin(), bosluklar.end());
for(int i = 0; i < k; i++){
bosluklar.pop_back();
}
for(int tmp : bosluklar){
cevap += tmp;
}
cout << cevap << endl;
}
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