#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define int long long
using namespace std;
string s,ses;
int n,m,x,y,z,sat[200005],b[200005];
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin>>n>>m;
z=10000000005;
for(int i=1;i<=n;i++){
cin>>sat[i];
z=min(z,sat[i]);
y=max(y,sat[i]);
if(i!=1){
b[i]=(sat[i]-sat[i-1])-1;
}
}
sort(b+1,b+n+1);
z=n-z+1;
for(int i=1;i<=m-1;i++){
y-=b[z];
z--;
}
cout<<y;
return 0;
}
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