source_code: import java.io.OutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.util.StringTokenizer;
  import java.math.BigInteger;
  import java.io.IOException;
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.io.InputStream;
  
  /**
   * Built using CHelper plug-in
   * Actual solution is at the top
   *
   * @author programajor
   */
  public class Main {
      public static void main(String[] args) {
          InputStream inputStream = System.in;
          OutputStream outputStream = System.out;
          InputReader in = new InputReader(inputStream);
          PrintWriter out = new PrintWriter(outputStream);
          TaskC solver = new TaskC();
          solver.solve(1, in, out);
          out.close();
      }
  
      static class TaskC {
          BigInteger mod = new BigInteger("1000000007");
  
          public void solve(int testNumber, InputReader in, PrintWriter out) {
              BigInteger x = new BigInteger(in.next());
              BigInteger k = new BigInteger(in.next());
              if (x.longValue() == 0) {
                  out.print(x);
                  return;
              }
              BigInteger pow = powerWithMod(new BigInteger("2"), k);
              BigInteger current = x.mod(mod).multiply(pow).mod(mod);
              BigInteger result = current.multiply(new BigInteger("2")).mod(mod)
                      .subtract(pow.subtract(new BigInteger("1")).mod(mod))
                      .mod(mod);
              out.print(result);
          }
  
          BigInteger powerWithMod(BigInteger base, BigInteger exponent) {
              if (exponent.longValue() == 0) {
                  return new BigInteger("1");
              }
              BigInteger temp = powerWithMod(base, exponent.divide(new BigInteger("2")));
              BigInteger term = temp.mod(mod);
              if (exponent.mod(new BigInteger("2")).intValue() == 0) {
                  return term.multiply(term.mod(mod)).mod(mod);
              } else {
                  return term.multiply(term.mod(mod)).multiply(base.mod(mod)).mod(mod);
              }
          }
  
      }
  
      static class InputReader {
          private BufferedReader reader;
          private StringTokenizer tokenizer;
  
          public InputReader(InputStream stream) {
              reader = new BufferedReader(new InputStreamReader(stream), 32768);
              tokenizer = null;
          }
  
          public String next() {
              while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                  try {
                      tokenizer = new StringTokenizer(reader.readLine());
                  } catch (IOException e) {
                      throw new RuntimeException(e);
                  }
              }
              return tokenizer.nextToken();
          }
  
      }
  }
  
  