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

#include "bits/stdc++.h"
using    namespace std;
typedef  long double ld;
#define  int long long
typedef  pair<int,int> pii;
#define  RAGE ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define  rep(i,n) for(i=0; i <n; i++)
#define  repv(i,k,n) for(int i=k; i<=n; i++)
#define  pb push_back
#define  mp make_pair
#define  F  first
#define  S  second
#define  sz(x)  (int)x.size()
#define  all(v) v.begin(),v.end()
#define  endl '\n'
#define  deb(x) c out<<#x<<" = "<<x<<endl
#define  gcd   __gcd
#define  inf   LLONG_MAX
#define  minf  LLONG_MIN 
#define  gi  greater<int> 
#define  gpi greater<pii>  
#define  sp(n) fixed<<setprecision(n)
const int mod = (int)(1e9+7);
int power(int x,int n)
{   
    if(n==0)    return 1;
    if(n==1)    return x%mod;
    if(n%2==0)  {   int y = power(x,n/2)%mod;return (y*y)%mod;}
    if(n&1)     {   int y = power(x,n-1);return (x%mod * y%mod)%mod;}
    return 0;
}
int pct(int x)
{   return __builtin_popcountll(x);}
int  lcm(int a,int b){return a*b/gcd(a,b);}
bool is_power_2(int n){ return log2(n)==floor(log2(n));}
bool is_prime(int n){for(int i=2; i*i<=n; i++)if(n%i==0)return 0; return 1;}
void db()
{   
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
}
void timeit()
{  
    #ifndef ONLINE_JUDGE
        cout<<"\nTime Elapsed: " <<sp(5)<< 1.0*clock() / CLOCKS_PER_SEC << " sec\n";
    #endif
}
int     dx []    =  {-1 , 0 , 1 , 0 ,-1,-1, 1,  1};
int     dy []    =  { 0 , 1 , 0 ,-1 ,-1, 1, 1, -1};
char    dir[]    =  {'U','R','D','L'};
/* ---------------------- 1.cpp --------------------------------- */
const int maxn = 1e6+5;
void solve(int tc)
{
    //cout<<"Case #"<<tc<<": ";
    int n,i,j,k,m,q,l,r;
    int ar[4];
    m=0;
    rep(i,4)    
        cin>>ar[i] , m+=ar[i];
    sort(ar,ar+4);
    for(i=0; i<(1<<4); i++)
    {
        int temp =0;
        for(j=0; j<6; j++)
        {
            if((1<<j)&i)
                temp += ar[j];
        }
        //  cout<<temp<<endl;
        if(temp == m/2)
        {   cout<<"YES"; return;}
    }
    cout<<"NO";

}  
signed main()
{
    // 1.cpp
    RAGE;
    db();    
    int t=1;
    // cin>>t;
    for(int i=1; i<=t; i++)
    {
        solve(i);
    }
    timeit();
    return 0;
}