algorithms
코드포스 (codeforces)
코드포스 318A (codeforces 318A)
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Problem - 318A - Codeforces
코드
import java.io.*;
public class CF318A {
static long n, k, ans;
static String ins[];
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
ins = br.readLine().split(" ");
n = Long.parseLong(ins[0]);
k = Long.parseLong(ins[1]);
if (n % 2 == 1) ans = (k > ((n + 1) >> 1)) ? (k - ((n + 1) >> 1)) << 1 : (k << 1) - 1;
else ans = (k > (n >> 1)) ? (k - (n >> 1)) << 1 : (k << 1) - 1;
bw.write(ans + "\n");
bw.flush();bw.close();
}
}