#include<bits/stdc++.h>
using namespace std;
const int N=1e6+4;
long long a[N],n,k;
int main()
{
cin>>n>>k;
for(int i=0;i<n;i++) cin>>a[i];
sort(a+1,a+n+1,greater<long long>());
long long s=0;
for(int i=0;i<=k;i++) s=s+a[i];
for(int i=k+1;i<n;i++) s=s-a[i];
cout<<s;
}
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