29 lines
720 B
Java
29 lines
720 B
Java
import java.io.*;
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import java.util.*;
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public class non {
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public static void main(String[] args) throws IOException {
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Scanner sc = new Scanner(System.in);
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int n = sc.nextInt();
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long k = sc.nextLong();
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long[] a = new long[n];
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for(int i=0;i<n;i++) a[i] = sc.nextLong();
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Arrays.sort(a);
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int cntn = 0;
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for(long i:a) if(i<0) cntn++;
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long sum = 0;
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if(k<=cntn){
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for(int i=0;i<k;i++) a[i] = -a[i];
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}else{
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for(int i=0;i<cntn;i++) a[i] = -a[i];
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Arrays.sort(a);
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k-=cntn;
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if(k%2==1) a[0] = -a[0];
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}
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for(long i:a) sum+=i;
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System.out.println(sum);
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}
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}
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