#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
#define BUFSIZE 1000000

char hoge[BUFSIZE] = {0};
long long A,B;
long long V,W,T;

int main(void){
  scanf("%lld %lld",&A ,&V);
  scanf("%d %d",&B ,&W);
  scanf("%d",&T);


  if(V > W && abs(B-A) <= T*(V-W)){
    printf("YES");
  }else{
    printf("NO");
  }

  return 0;
}
