This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<iostream>
#include<stdio.h>
#include<math.h>
#include<map>
#include<string>
#include<algorithm>
#include<vector>
#include<string.h>
#include<utility>
#include<set>
#include<cmath>
#include<queue>
#include<deque>
#include<functional>
#include<stack>
#include<limits.h>
#include<iomanip>
#include<unordered_map>
#include<numeric>
#include<tuple>
#include<bitset>
using namespace std;
#define MOD 1000000007
#define int long long
#define endl '\n'
void solve(){
int n,k; cin>>n>>k;
vector<int> a(n+1);
for(int i=1; i<=n; i++) cin>>a[i];
vector<int> gap;
int big=a[n]-a[1]+1;
for(int i=2; i<=n; i++){
gap.push_back(a[i]-a[i-1]-1);
}
sort(gap.begin(),gap.end(),greater<int>());
for(int i=0; i<k-1; i++) big-=gap[i];
cout<<big;
}
signed main(){
// freopen("file.in", "r", stdin);
// freopen("file.out", "w", stdout);
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int T=1;
// cin>>T;
while(T--){
solve();
cout<<endl;
}
return 0;
}
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