44 58 90 53
 20 14 37 71
 4 2 4 2
 1 2 5 5
 1 2 8 9
 99 100 3 98
 92 69 83 97
 3 1 1 1
 18 88 18 18
 1 1 1 1
 69 7 44 30
 90 30 30 30
 1 2 3 5
 1 1 3 1
 6 3 6 6
 26 52 7 19
 6 4 8 6
 10 2 3 5
 34 11 84 39
 1 1 14 12
 3 2 1 1
 2 4 6 6
 1 1 2 1
 72 96 2 26
 97 95 91 27
 1 2 1 3
 1 1 2 3
 1 1 1 2
 1 1 10 20
 2 3 2 5
 1 2 10 7
 2 1 28 9
 4 4 4 8
 2 2 4 6
 72 52 62 62
 76 97 99 74
 100 100 99 100
 30 74 41 63
 5 10 1 6
 18 17 17 20
 2 4 1 1
 7 3 6 3
 1 1 4 5
 2 2 6 2
 1 2 6 3
 3 5 1 3
 70 100 10 86
 48 14 3 31
 2 6 3 2
 2 3 10 10
 4 4 12 4
 14 9 10 6
 100 98 99 97
 5 7 1 3
 1 1 4 2
 14 10 18 24
 1 100 100 1
 1 2 4 5
 1 2 3 4
 1 2 3 3
 4 4 4 5
 66 68 16 82
 1 2 3 2
 2 3 3 4
 100 100 100 100
 1 2 2 7
 3 14 36 53
 1 1 3 4

NO
 YES
 YES
 NO
 YES
 NO
 NO
 YES
 NO
 YES
 NO
 YES
 NO
 YES
 NO
 YES
 YES
 YES
 YES
 YES
 NO
 NO
 NO
 YES
 NO
 NO
 NO
 NO
 NO
 NO
 YES
 NO
 NO
 NO
 YES
 YES
 NO
 YES
 YES
 NO
 YES
 NO
 NO
 YES
 YES
 YES
 NO
 YES
 NO
 NO
 YES
 NO
 YES
 YES
 YES
 NO
 YES
 YES
 YES
 NO
 NO
 NO
 YES
 YES
 YES
 NO
 YES
 NO

    import java.io.BufferedWriter;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.io.OutputStreamWriter;
    import java.io.PrintWriter;
    import java.io.Writer;
    import java.util.Arrays;
    import java.util.InputMismatchException;
    import java.util.*;
    import java.io.*;
    import java.math.*;
    public class Main7{
     
    static class Pair
        { 
            int x;
            int y;
            int z;
            public Pair(int x,int y,int z) 
            {     
                this.x= x; 
                this.y= y;
                this.z=z;
            }     
            
        @Override
                public int hashCode() 
                { 
                    final int temp = 14; 
                    int ans = 1; 
                    ans =x*31+y*13; 
                    return ans; 
                } 
          
                // Equal objects must produce the same 
                // hash code as long as they are equal 
            @Override
            public boolean equals(Object o) 
            { 
                if (this == o) { 
                    return true; 
                } 
                if (o == null) { 
                    return false; 
                } 
                if (this.getClass() != o.getClass()) { 
                    return false; 
                } 
                Pair other = (Pair)o; 
                if (this.x != other.x || this.y!=other.y) { 
                    return false; 
                } 
                return true; 
            } 
                
        } 
        static class Pair1
        {
            String x;
            int y;
            int z;
            
        }
        static class Compare
        { 
            static void compare(Pair arr[], int n) 
            { 
                // Comparator to sort the pair according to second element 
            /*    Arrays.sort(arr, new Comparator<Pair>() { 
                    @Override public int compare(Pair p1, Pair p2) 
                    { 
                        if(p1.start>p2.start)
                        {
                            return 1;
                        }
                        else if(p1.start==p2.start)
                        {
                            return 0;
                        }
                        else
                        {
                            return -1;
                        }
                    } 
                }); */
            }
            
        }
        
        
        public static long pow(long a, long b)
        {
            long result=1;
            while(b>0)
            {
                if (b % 2 != 0)
                {
                    result=(result*a)%998244353;
                    b--;
                } 
                a=(a*a)%998244353;
                b /= 2;
            }   
            return result;
        }
        public static long fact(long num)
        {
                    long value=1;
                    int i=0;
                    for(i=2;i<num;i++)
                    {
                        value=((value%mod)*i%mod)%mod;
                    }
                    return value;
                }
                public static long gcd(long a, long b)
                {
                    if (a == 0)
                        return b;
                    return gcd(b%a, a);
                }
                
        /*        public static long lcm(long a,long b)
                {
                    return a * (b / gcd(a, b));
                }
            */    public static long sum(int h)
                {
                    return (h*(h+1)/2);
                }
                public static void dfs(int parent,boolean[] visited,int[] dp)
                {
                    ArrayList<Integer> arr=new ArrayList<Integer>();
                    arr=graph.get(parent);
                    visited[parent]=true;
                    for(int i=0;i<arr.size();i++)
                    {
                        int num=(int)arr.get(i);
                        if(visited[num]==false)
                        {
                            dfs(num,visited,dp);
                        }
                        dp[parent]=Math.max(dp[num]+1,dp[parent]);
                    }
                }
            //    static int flag1=0;
                static int[] dis;
                static int mod=1000000007;
                static ArrayList<ArrayList<Integer>> graph;
                
                public static void bfs(int num,int size)
                {
                    boolean[] visited=new boolean[size+1];
                    Queue<Integer> q=new LinkedList<>();
                    q.add(num);
                    ans[num]=1;
                    visited[num]=true;
                    while(!q.isEmpty())
                    {
                        int x=q.poll();
                        ArrayList<Integer> al=graph.get(x);
                        for(int i=0;i<al.size();i++)
                        {
                            int y=al.get(i);    
                            if(visited[y]==false)
                            {
                                q.add(y);
                                ans[y]=ans[x]+1;
                                visited[y]=true;
                            }
                        }
                    }
                }
                static int[] ans;
                
                
                
                
                
                
                
                
                
            //    static int[] a;              
                public static int[] sort(int[] a)
                {
                    int n=a.length;
                    ArrayList<Integer> ar=new ArrayList<>();
                    for(int i=0;i<a.length;i++)
                    {
                        ar.add(a[i]);
                    }
                    Collections.sort(ar);
                    for(int i=0;i<n;i++)
                    {
                        a[i]=ar.get(i);
                    }
                    return a;
                }
                static public void main(String args[])throws IOException
                {
                    int[] a=new int[4];
    				int total=0;
    				for(int i=0;i<4;i++)
    				{
    					a[i]=i();
    					total+=a[i];
    				}
    				if(total%2==1)
    					pln("NO");
    				else
    				{
    					int ans=0;
    					int n=4;
    					for(int i=0;i<n;i++)
    					{
    						if(total/2==a[i])
    						{
    							ans=1;
    						}
    					}
    					for(int i=0;i<n;i++)
    					{
    						for(int j=i+1;j<n;j++)
    						{
    							if(total/2==a[i]+a[j])
    							{
									ans=1;
    							}
    						}
    					}
    					if(ans==1)
    						pln("YES");
    					else
    						pln("NO");
    				}
                }
                
                /**/
                static InputReader in=new InputReader(System.in);
                    static OutputWriter out=new OutputWriter(System.out);
                    public static long l()
                    {
                        String s=in.String();
                        return Long.parseLong(s);
                    }
                    public static void pln(String value)
                    {
                        System.out.println(value);
                    }
                    public static int i()
                    {
                        return in.Int();
                    }
                    public static String s()
                    {
                        return in.String();
                    }
        }
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
            class InputReader {
                 
                private InputStream stream;
                private byte[] buf = new byte[1024];
                private int curChar;
                private int numChars;
                private 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 Int() {
                    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 String String() {
                    int c = read();
                    while (isSpaceChar(c))
                        c = read();
                    StringBuilder res = new StringBuilder();
                    do {
                        res.appendCodePoint(c);
                        c = read();
                    } while (!isSpaceChar(c));
                    return res.toString();
                }
             
                public boolean isSpaceChar(int c) {
                    if (filter != null)
                        return filter.isSpaceChar(c);
                    return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
                }
             
                public String next() {
                    return String();
                }
             
                public interface SpaceCharFilter {
                    public boolean isSpaceChar(int ch);
                }
            }
             
            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 print(Object...objects) {
                    for (int i = 0; i < objects.length; i++) {
                        if (i != 0)
                            writer.print(' ');
                        writer.print(objects[i]);
                    }
                }
             
                public void printLine(Object...objects) {
                    print(objects);
                    writer.println();
                }
             
                public void close() {
                    writer.close();
                }
             
                public void flush() {
                    writer.flush();
                }
             
                }
             
                class IOUtils {
             
                public static int[] readIntArray(InputReader in, int size) {
                    int[] array = new int[size];
                    for (int i = 0; i < size; i++)
                        array[i] = in.Int();
                    return array;
                }
             
                } 
     