/**

author:	©LoneWolfDON
Git: MahinHossainMunna

**/
/*

*/
#include <stdio.h>

int main()
{
    int A,B,C,D;
    scanf("%d%d%d%d",&A, &B, &C, &D);

    int X= A - D;
    int Y= C - B;

    if(X>=Y)
        printf("Yes\n");

    else
        printf("No\n");

    return 0;
}
