#include <iostream>

using namespace std;

int main()
{
    int x,y,z;
    char k,l;
    cin>>x>>k>>y>>l>>z;
    if(x+y==z||x-y==z||x*y==z){cout<<"Yes";}
    else if (x+y!=z){cout<<x+y;}

    else if (x-y!=z){cout<<x-y;}

    else if (x*y!=z){cout<<x*y;}

}