#include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
using ll = long long;
using ii = pair<int, int>;
using aa = array<int,3>;
const int N = 5e5+5;
const int INF = 1e9;
const int MOD = 998244353;
int a[N];
int b[N];
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);cout.tie(NULL);
int n,k;
cin >> n >> k;
for(int i=1;i<=n;i++) {
cin >> a[i];
if(i>1) {
b[i-1]=a[i]-a[i-1]-1;
}
}
sort(b+1,b+n,greater<>());
int ans=a[n]-a[1]+1;
for(int i=1;i<k;i++) {
ans-=b[i];
}
cout << ans;
return 0;
}
/*
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*/
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