#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
#define Inf 1000000001


int main(){
	
	int N,a,b,c;
	cin>>N>>a>>b>>c;
	
	if(a==b)cout<<"No"<<endl;
	else if(a==c)cout<<"No"<<endl;
	else {
		int x = a;
		int y = c+N;
		if(y-x+1 > N){
			if(b>a)cout<<"Yes"<<endl;
			else cout<<"No"<<endl;
		}
		else{
			if(b<a)cout<<"Yes"<<endl;
			else cout<<"No"<<endl;
		}
	}
	
	return 0;
}