#include    <stdio.h>
#include    <string.h>
#include    <stdlib.h>

int verbose = 1;
int main(void)
{
    long int	a, b, v, w, t;

    if (fscanf(stdin, "%ld %ld", &a, &v) == EOF) {
	printf("NO\n");
    }
    if (fscanf(stdin, "%ld %ld", &b, &w) == EOF) {
	printf("NO\n");
    }
    if (fscanf(stdin, "%ld", &t) == EOF) {
	printf("NO\n");
    }

    if (v <= w) {
	printf("NO\n");
    } else {
	if (labs(a - b) - (v - w) <= t) {
	    printf("YES\n");
	} else {
	    printf("NO\n");
	}
    }
    return 0;
}

