import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

//URAL STEAKS
public class P {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(System.out);
        String line;
        int ans;
        line = br.readLine().trim();
        String str[];
        str = line.split(" ");
        int N = Integer.parseInt(str[0]);
        int K = Integer.parseInt(str[1]);
        if(2*N%K>1){
            ans = (2*N/K)+1;
        }else{
            ans = (2*N/K);
        }
        out.print(ans);
        out.flush();
    }
}

При N = 1, K = 2 программа выдаёт 1, а должна 2 по условию задачи.

Please give answer in English...

if (n<=k) the answer is 2

(2*N)%K
not 2*N%K