#include <stdio.h>
#include <inttypes.h>

int64_t zettaiti(int64_t mofu) {
	return mofu < 0 ? -mofu : mofu;
}

int main(void) {
	int64_t A, V;
	int64_t B, W;
	int64_t T;
	if (scanf("%" SCNd64 "%" SCNu64, &A, &V) != 2) return 1;
	if (scanf("%" SCNd64 "%" SCNu64, &B, &W) != 2) return 1;
	if (scanf("%" SCNd64, &T) != 1) return 1;
	if (V <= W && A != B) {
		puts("NO");
	} else {
		int64_t kyori, hayasa;
		kyori = zettaiti(A - B);
		hayasa = V - W;
		puts(hayasa * T >= kyori ? "YES" : "NO");
	}
	return 0;
}
