#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin>>a;
    if(a%2==0&&a>50) cout<<"yes";
    else cout<<"no";
    return 0;
}
#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin>>a;
    if(a%2==0&a>50) cout<<"yes";
    else cout<<"no";
    return 0;
}

这叫按位与