difnple

//#include<bits/stdc++.h>
#include<iostream>

#define long long long
#define nln '\n'

using namespace std;

// Global variables: a, b, c, d
long a, b, c, d;

int main()
{
    cin >> a >> b >> c >> d;
    if (a+b > c+d)
        cout << "Yes";
    else
        cout << "No";
    return 0;
}