package problems303; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintStream; import java.io.StringReader; import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class Main { List ps = new ArrayList<>(); int[] dxs = {-2, -2, -1, -1, +1, +1, +2, +2}; int[] dys = {-1, +1, -2, +2, -2, +2, -1, +1}; public void dfs(int x, int y, int depth) { if (depth < 0) { return; } ps.add(new int[]{x, y}); for (int i = 0; i < 8; i++) { int dx = dxs[i]; int dy = dys[i]; dfs(x + dx, y + dy, depth - 1); } } public void run() throws IOException { int X = io.nextInt(); int Y = io.nextInt(); dfs(0, 0, 3); for (int[] p : ps) { if (p[0] == X && p[1] == Y) { System.out.println("YES"); return; } } System.out.println("NO"); } // @formatter:off private static final int mod = (int) 1e9 + 7; final IOFast io = new IOFast(); void main() throws IOException { try { run(); } catch (RuntimeException ignore) { } finally { System.out.flush(); } } public static void main(String[] args) throws IOException { new Main().main(); } public static String dtos(double x, int n) { StringBuilder sb = new StringBuilder(); if (x < 0) { sb.append('-'); x = -x; } x += Math.pow(10, -n) / 2; sb.append((long) x); sb.append("."); x -= (long) x; for (int i = 0; i < n; i++) { x *= 10; sb.append((int) x); x -= (int) x; } return sb.toString(); } public static class IOFast { private BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); void setStringIn(String input) throws IOException { in.close(); in = new BufferedReader(new StringReader(input)); } void setStringOut(ByteArrayOutputStream output) throws IOException { System.out.flush(); System.setOut(new PrintStream(output)); } void setStringIO(String input, ByteArrayOutputStream output) throws IOException { setStringIn(input); setStringOut(output); } private static int pos, readLen; private static final char[] buffer = new char[1024 * 8]; private static char[] str = new char[500*8*2]; private static boolean[] isDigit = new boolean[256]; private static boolean[] isSpace = new boolean[256]; private static boolean[] isLineSep = new boolean[256]; static { System.setOut(new PrintStream(new BufferedOutputStream(System.out))); for(int i = 0; i < 10; i++) { isDigit['0' + i] = true; } isDigit['-'] = true; isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true; isLineSep['\r'] = isLineSep['\n'] = true; } public int read() throws IOException { if(pos >= readLen) { pos = 0; readLen = in.read(buffer); if(readLen <= 0) { throw new RuntimeException(); } } return buffer[pos++]; } public int nextInt() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; int ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; } public long nextLong() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; long ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; } public char nextChar() throws IOException { while(true) { final int c = read(); if(!isSpace[c]) { return (char)c; } } } int reads(int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } if(str.length == len) { char[] rep = new char[str.length * 3 / 2]; System.arraycopy(str, 0, rep, 0, str.length); str = rep; } str[len++] = (char)c; } } catch(RuntimeException e) { ; } return len; } public char[] nextLine() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isLineSep); try { if(str[len-1] == '\r') { len--; read(); } } catch(RuntimeException e) { ; } return Arrays.copyOf(str, len); } public String nextString() throws IOException { return new String(next()); } public char[] next() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); return Arrays.copyOf(str, len); } public double nextDouble() throws IOException { return Double.parseDouble(nextString()); } public long[] nextLongArray(final int n) throws IOException { final long[] res = new long[n]; for(int i = 0; i < n; i++) { res[i] = nextLong(); } return res; } public int[] nextIntArray(final int n) throws IOException { final int[] res = new int[n]; for(int i = 0; i < n; i++) { res[i] = nextInt(); } return res; } public int[][] nextIntArray2D(final int n, final int k) throws IOException { final int[][] res = new int[n][]; for(int i = 0; i < n; i++) { res[i] = nextIntArray(k); } return res; } public int[][] nextIntArray2DWithIndex(final int n, final int k) throws IOException { final int[][] res = new int[n][k+1]; for(int i = 0; i < n; i++) { for(int j = 0; j < k; j++) { res[i][j] = nextInt(); } res[i][k] = i; } return res; } public double[] nextDoubleArray(final int n) throws IOException { final double[] res = new double[n]; for(int i = 0; i < n; i++) { res[i] = nextDouble(); } return res; } } // @formatter:on }