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

#define rep(i,k,n) for(int (i)=(k);(i)<(n);(i)++)
#define max(a,b) (a)>(b)?(a):(b)
#define min(a,b) (a)<(b)?(a):(b)
#define llong long long

int main(){
	llong A,V; scanf("%lld %lld",&A,&V);
	llong B,W; scanf("%lld %lld",&B,&W);
	llong T; scanf("%lld",&T);
  	llong dist;
  	if( A-B < 0 ) dist = B-A;
  	else dist = A-B;
	if( dist <= (V-W)*T ) printf("YES");
	else printf("NO");
	return 0;
}
