#include<stdio.h>
#include<conio.h>
using namespace std;
int main ()
{
int a,b,c;
cout<<"Enter number a -";
cin>>a;
cout<<"Enter number b -";
cin>>b;
cout<<"Enter number c -";
cin>>c;
if(a==b && a==c && b==c)
cout<<"yes";
else
cout<<"no";
return 0;
}