#include <iostream>

using namespace std;

int main() {
    int nnnn;
    int n,a,b;
    int nn,na,nb;
    int nnn,nna,nnb;
    
    int size = sizeof n;
    int sizen = sizeof nn;
    int sizenn = sizeof nnn;
    
    n = ((b*size)+a) * 2;
    nn = ((nb*sizen)+na) * 2;
    nnn = n+nn;
    nnnn = ((nnb*sizenn)+nna) * 2;
    
    if(nnn == nnnn) {
        cout << "YES";
    }
        
    else{
        cout << "NO";
    }
    return 0;
}