#include<bits/stdc++.h>
#define int long long
using namespace std;
int32_t main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n,k;
cin>>n>>k;
vector<int>a(n);
for(int i=0;i<n;i++) cin>>a[i];
int t=a[n-1]-a[0]+1;
vector<int>b;
for(int i=0;i<n;i++)
{
b.push_back(a[i]-a[i-1]-1);
}
sort(b.rbegin(),b.rend());
for(int i=0;i<b.size()&&i<k-1;i++)
{
t-=b[i];
}
cout<<t<<endl;
}
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