#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>
#include<cassert>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

int f(const vector<int> &A, const vector<int> &B, int x){
    int sum = 0;
    int N = A.size();
    
    for(int i = 0; i < N; i++){
        sum += B[i] * abs(A[i] - x);
    }
    return sum;
}

int minf(const vector<int> &A, const vector<int> &B, int K){
    int sum = 0, res = INF;
    int N = A.size();
    int a = 0, b = 0;
    int ca = 0, cb = 0;
    int sa = 0, sb = 0;
    
    for(int i = 0; i < N; i++){
        
        if(B[i] > 0) {
            sa += A[i];
        } else {
            sb += A[i];
        }
    }
    
    for(int i = 0; i < N; i++){
        sum = 0;
        sum += (sa - a) - A[i] * (K - ca);
        sum -= (sb - b) - A[i] * (N - K - cb);
        sum += A[i] * ca - a;
        sum -= A[i] * cb - b;
        
        if(B[i] > 0) {
            ca++;
            a += A[i];
        } else {
            cb++;
            b += A[i];
        }
        // assert(f(A, B, A[i]) == sum);
        res = min(res, sum);
    }
    
    return res;
}


void test(){
	int N, K;
    
    int  res = INF;
    vector<int> A, B;
    
    cin>>N>>K;
	
    A.resize(N);
    
    B.resize(K, 1);
    
    for(int i = K; i < N; i++){
        B.push_back(-1);
    }
    
    for(int i = 0; i < N; i++){
        cin>>A[i];
    }
    
    A.erase(unique(A.begin(), A.end()), A.end());
    
    if(A.size() != N) exit(2);
    
    cout<<res<<endl;
}

signed main(){
	cout<<fixed<<setprecision(10);
	
    test();
    
	return 0;
}