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

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

    fscanf(stdin, "%ld %ld", &a, &v);
    fscanf(stdin, "%ld %ld", &b, &w);
    fscanf(stdin, "%ld", &t);

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