#include<bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
using namespace std;
int dx[4] = {0, 0, -1, 1};
int dy[4] = {-1, 1, 0, 0};
int main(){
int a,b;
cin >> a >> b;
vector<int> gr(a),g;
for(int i = 0; i < a; i++){
cin >> gr[i];
}
for(int i = 1; i < a; i++){
g.pb(gr[i] - gr[i - 1] + 1);
}
int sr = 0;
sort(g.begin(), g.end());
for(int i = 1; i <= a - b; i++){
sr += gr[i];
}
cout << sr + a - b;
}
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