import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author out_of_the_box
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        CIvanTheFoolAndTheProbabilityTheory solver = new CIvanTheFoolAndTheProbabilityTheory();
        solver.solve(1, in, out);
        out.close();
    }

    static class CIvanTheFoolAndTheProbabilityTheory {
        private static final int MOD = 1000000007;

        public void solve(int testNumber, InputReader in, OutputWriter out) {
            int n = in.nextInt();
            int m = in.nextInt();
            int l = Math.max(n, m);
            int fn = 1;
            int fm = 1;
            int[][] prev = new int[2][2];
            int[][] next = new int[2][2];
            for (int i = 0; i < 2; i++) {
                for (int j = 0; j < 2; j++) {
                    prev[i][j] = 1;
                }
            }
            for (int c = 2; c <= l; c++) {
                for (int i = 0; i < 2; i++) {
                    for (int j = 0; j < 2; j++) {
                        if (j == 1) {
                            next[i][j] = MathUtility.add(prev[i][other(j)], prev[other(i)][j], MOD);

                        } else {
                            next[i][j] = prev[other(i)][other(j)];
                        }
                    }
                }
                if (c == n) fn = next[1][1];
                if (c == m) fm = next[1][1];
                for (int i = 0; i < 2; i++) {
                    for (int j = 0; j < 2; j++) {
                        prev[i][j] = next[i][j];
                    }
                }
            }
            int te = MathUtility.sub(fm, 1, MOD);
            int ans = MathUtility.add(fn, te, MOD);
            ans = MathUtility.mult(ans, 2, MOD);
            out.print(ans);
        }

        private int other(int i) {
            if (i == 0) return 1;
            return 0;
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }

    static class MathUtility {
        public static int sub(int a, int b, int MOD) {
            return add(a, MOD - b, MOD);
        }

        public static int mult(int a, int b, int MOD) {
            long temp = ((long) a) * ((long) b);
            if (temp >= ((long) MOD)) {
                temp %= MOD;
            }
            return (int) temp;
        }

        public static int add(int a, int b, int MOD) {
            int res = a + b;
            if (res >= MOD) {
                res -= MOD;
            }
            return res;
        }

    }

    static class OutputWriter {
        private final PrintWriter writer;

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void close() {
            writer.close();
        }

        public void print(int i) {
            writer.print(i);
        }

    }
}

