#include <bits/stdc++.h>

#define mp make_pair
#define mt make_tuple
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define forn(i, n) for (int i = 0; i < (int)(n); ++i)
#define for1(i, n) for (int i = 1; i <= (int)(n); ++i)
#define ford(i, n) for (int i = (int)(n) - 1; i >= 0; --i)
#define fore(i, a, b) for (int i = (int)(a); i <= (int)(b); ++i)

using namespace std;

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vpi;
typedef vector<vi> vvi;
typedef long long i64;
typedef vector<i64> vi64;
typedef vector<vi64> vvi64;
typedef pair<i64, i64> pi64;
typedef double ld;

template<class T> bool uin(T &a, T b) { return a > b ? (a = b, true) : false; }
template<class T> bool uax(T &a, T b) { return a < b ? (a = b, true) : false; }

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.precision(10);
    cout << fixed;
#ifdef LOCAL_DEFINE
    freopen("input.txt", "rt", stdin);
#endif

    vi a(4);
    forn(i, 4) cin >> a[i];
    bool ok = false;
    forn(mask, 1 << 4) {
        int s = 0;
        forn(i, 4) (s += a[i] * ((mask >> i) & 1 ? 1 : -1));
        ok |= s == 0;
    }
    cout << (ok ? "Yes" : "No") << '\n';

#ifdef LOCAL_DEFINE
    cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
    return 0;
}

#include <iostream>
#include <vector>

using namespace std;

int main(){
    vector<int> v(4);
    int sum = 0;
    for(int i=0;i<4;i++){
        cin >> v[i];
        sum += v[i];
    }

    for(int i=1;i<16;i++){
        int tsum = 0;
        for(int j=0;j<4;j++){
            if(i & (1<<j)){
                tsum += v[j];
            }
        }

        if(tsum == sum - tsum){
            cout << "Yes" << endl;
            return 0;
        }
    }

    cout << "No" << endl;
    return 0;
}