#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
#define RST(i,n) memset(i,n,sizeof i)
#define SZ(a) (int)a.size()
#define ALL(a) a.begin(),a.end()
#define X first
#define Y second
#define eb emplace_back
#ifdef cold66
#define debug(...) do{\
    fprintf(stderr,"LINE %d: (%s) = ",__LINE__,#__VA_ARGS__);\
    _do(__VA_ARGS__);\
}while(0)
template<typename T>void _do(T &&_x){cerr<<_x<<endl;}
template<typename T,typename ...S> void _do(T &&_x,S &&..._t){cerr<<_x<<", ";_do(_t...);}
template<typename _a,typename _b> ostream& operator << (ostream &_s,const pair<_a,_b> &_p){return _s<<"("<<_p.X<<","<<_p.Y<<")";}
template<typename It> ostream& _OUTC(ostream &_s,It _ita,It _itb)
{
    _s<<"{";
    for(It _it=_ita;_it!=_itb;_it++)
    {
        _s<<(_it==_ita?"":",")<<*_it;
    }
    _s<<"}";
    return _s;
}
template<typename _a> ostream &operator << (ostream &_s,vector<_a> &_c){return _OUTC(_s,ALL(_c));}
template<typename _a> ostream &operator << (ostream &_s,set<_a> &_c){return _OUTC(_s,ALL(_c));}
template<typename _a,typename _b> ostream &operator << (ostream &_s,map<_a,_b> &_c){return _OUTC(_s,ALL(_c));}
template<typename _t> void pary(_t _a,_t _b){_OUTC(cerr,_a,_b);cerr<<endl;}
#define IOS()
#else
#define debug(...)
#define pary(...)
#define endl '\n'
#define IOS() ios_base::sync_with_stdio(0);cin.tie(0);
#endif // cold66
//}
template<class T> inline bool chkmax(T &a, const T &b) { return b > a ? a = b, true : false; }
template<class T> inline bool chkmin(T &a, const T &b) { return b < a ? a = b, true : false; }

const ll MAXn=1e5+5,MAXlg=__lg(MAXn)+2;
const ll MOD=1000000007;
const ll INF=0x3f3f3f3f;

int a[5];
int main(){
    IOS();
    int sum = 0;
    for (int i=0;i<4;++i) {
        cin >> a[i];
        sum += a[i];
    }
    bool ok = false;
    for (int i=0;i<4;++i) {
        if (sum - a[i] == a[i]) ok = true;
        for (int j=i+1;j<4;++j) {
            int cur = a[i] + a[j];
            if (cur == sum - cur) ok = true;
        }
    }
    cout << (ok ?"Yes":"No") << endl;
}


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

int main() {
  long long int A, B, C, D;
  cin >>A >> B >>C >> D;
  string ans ="No";
  
  for (int a=0; a<2; a++){
    for (int b =0; b<2; b++){
      for (int c =0; c<2; c++){
        for(int d =0; d<2; d++){
          if(2*(A*a+B*b+C*c+D*d) == A + B + C+ D){
            ans ="Yes";
          }
        }
      }
    }
  }
  cout << ans << endl;
}