#include <bits/stdc++.h>
using namespace std;
int main() {
int N, K;
cin >> N >> K;
vector<long long> T(N);
for(int i = 0; i < N; i++) {
cin >> T[i];
}
long long toplam = T[N-1] + 1 - T[0];
vector<long long> bosluklar;
for(int i = 0; i < N-1; i++) {
long long bosluk = T[i+1] - (T[i] + 1);
bosluklar.push_back(bosluk);
}
sort(bosluklar.begin(), bosluklar.end(), greater<long long>());
for(int i = 0; i < N-K; i++) {
toplam -= bosluklar[i];
}
cout << toplam << endl;
return 0;
}
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