#include <bits/stdc++.h>
#define _ ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define fore(i,a,b) for(lli i = (a), abcdxd = (b); i < abcdxd; i++)
#define f first
#define s second
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define ENDL '\n'
#define sz(s) lli((s).size())
#define pb push_back
using namespace std;
typedef long long lli;
// typedef long long LLI;
typedef pair<lli, lli> ii;
typedef vector<lli> vi;
typedef vector<ii> vii;
typedef long double ld;
#define deb(x) cout << #x << ": " << x << endl;
#define BIGLLI __int128
void solve(){
lli n, k; cin >> n >> k;
vi b(n); for (auto & i : b) cin >> i;
lli ans = b[n-1] + 1 - b[0], res = 0;
vi v(n-1); fore(i,1,n) v[i-1] = b[i] - b[i - 1] - 1;
sort(rall(v));
fore(i,0,k-1) res += v[i];
cout << ans - res << endl;
}
int main(){ _
// lli t; cin >> t;
// while (t--)
solve();
}
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