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