#include<bits/stdc++.h>
using namespace std;
#define ll long long

int main()
{
    ll i,j,n;
    n = 4;
    vector<ll> a(n);
    ll s = 0;
    for(i=0;i<n;i++) cin>>a[i], s+=a[i];
    for(i=0;i<n;i++)
    {
        if(s-a[i] == a[i]) 
        {
            cout<<"Yes";
            return 0;
        }
    }
    for(i=0;i<n;i++)
    {
        for(j=i+1;j<n;j++)
        {
            if(s-(a[i]+a[j]) == a[i]+a[j])
            {
                cout<<"Yes";
                return 0;
            }
        }
    }
    cout<<"No";
}
#include "bits/stdc++.h"
using namespace std;
#define dracarys ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
//#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC target("avx2")

#define ll long long
#define ld long double
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#define dbg(x) cout << "[ " << x << " ] " 
#define ump unordered_map

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
struct chash{
    int operator()(int x) const { return x ^ RANDOM; }
};

void solve(int tt){
    int n = 4;
    vector<ll> v(n);
    for (auto& it : v) cin >> it;
    ll sum = accumulate(all(v),0);
    bool flag = 0; 
    for (int i = 0;i < (1 << n);i++){
        ll sub = 0;
        for (int j = 0;j < n;j++){
            if (i & (1 << j)){
                sub += v[j];
            }
        }
        flag |= (sub * 2ll == sum);
    }
    if (sum % 2 == 0 and flag){
        cout << "Yes\n";
    }
    else
        cout << "No\n";
}

int main(){

    // #ifndef ONLINE_JUDGE 
    //     freopen("input.txt", "r", stdin);
    //     freopen("output.txt", "w", stdout);
    // #endif

    dracarys

    int tt = 0,t = 1;
    //cin >> t;

    while(t--){solve(++tt);}

    cerr << "processor time: " << clock() / (double) CLOCKS_PER_SEC << "s    ";

    return 0;
}
