#include <stdio.h> 

int main() {
    int numList[4] = {0,0,0,0};
    for(int i = 0 ; i < 4 ; i ++){
        scanf("%d",&numList[i]);
    }
    if(numList[0] < numList[1] && numList[2] > numList[3]){
        printf("YES");
    }else{
        printf("NO");
    }
    return 0;
}