#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if(a>=b&&b>=c||a<=b&&b<=c)
	{
		cout<<"Yes";
	}
	else 
	{
		cout<<"No";	
	}
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; if(a>=b&&b>=c||a<=b&&b<=c) { cout<<"Yes"; } else { cout<<"No"; } return 0; }

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if(a>=b&&b>=c||a<=b&&b<=c)
	{
		cout<<"Yes";
	}
	else 
	{
		cout<<"No";	
	}
	return 0;
}