#include <bits/stdc++.h>
//qwerty47924692
using namespace std;
using ll = long long;
const ll N=2e5+29;
const string br="617283";
#define sz(a)(ll)a.size()
#define f first
#define s second
ll n,t[N],c[N],k;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cin>>n>>k;
k--;
for(ll i=1;i<=n;i++){
cin>>t[i];
if(i>1)c[i]=t[i]-t[i-1]-1;
}
ll ans=t[n]-t[1]+1;
sort(c+1,c+1+n);
reverse(c+1,c+1+n);
for(ll i=1;i<=k;i++){
ans-=c[i];
}
cout<<ans;
}
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