#include<stdio.h>
#include<string.h>
//#include<stdlib.h>
#include<math.h>
#define N 20 

int main(void){
  double A,V,B,W,T;
  scanf("%lf %lf",&A,&V);
  scanf("%lf %lf",&B,&W);
  scanf("%lf",&T);
  //printf("%ld %ld %ld %ld %ld\n",A,V,B,W,T);
  if(fabs(A - B) <= fabs(W - V) * T){
    printf("YES\n");
  }else{
      printf("NO");
    }
  return 0;
}