#include <iostream>

using namespace std;

int main()
{   int n,m,hmin,hmax,g[1000],h[1000],i,j,ok,a,minim,x;
   cin>>n>>m>>hmin>>hmax;
   for(i=0;i<n;i++)
    cin>>g[i];
   for(i=0;i<m;i++)
    cin>>h[i];
   for(i=0;i<n;i++){ok=0;
    if(g[i]<hmin)
    {a=hmin-g[i];
    minim=100;
        for(j=0;j<m;j++)
            if(a<=h[j])
                if(minim>h[j]-a)
                {minim=h[j]-a;
                x=j;}
     if(minim!=100)
     {
         ok=1;
         g[x]=0;
     }}
    if(g[i]>=hmin&&g[i]<=hmax)
        ok=1;
   }
   if(ok==1)
    cout<<"Yes";
   else cout<<"No";
    return 0;
}