#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main()
{

    unsigned int oi[4];
    bool flag = false;
    int sum = 0;
    cin >> oi[0] >> oi[1] >> oi[2] >> oi[3];

    sum = oi[0] + oi[1] + oi[2] + oi[3];
    for(int i=0; i<4; i++){
        if(oi[i] == (sum - oi[i])){
            flag = true;
            break;
        }
    }

    for(int i=0; i<4-1; i++){
        for(int j=1; j<4; j++){
            if((oi[i] + oi[j]) == (sum - oi[i] - oi[j]))
                flag = true;
        }
    }

    if(flag == true)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;
    return 0;
}
#include <iostream>

int main(){
    int A,B,C,D;
    std::cin >> A >> B >> C >> D;

    if (A==B+C+D || B==A+C+D || C==A+B+D || D==A+B+C || A+B==C+D || A+C==B+D || A+D==B+C){
        std::cout << "Yes" << std::endl;
    }
    else{
        std::cout << "No" << std::endl;
    }

    

    return 0;

}
