#include<stdio.h>

void main(){
  int a,v,b,w,t,aa,bb;
  scanf("%d%d%d%d%d",a,v,b,w,t);
  if(a>b){
    aa= a - v*t;
    bb= b - W*t;
    if(aa<=bb){
      printf("YES");
    }else{
      printf("NO");
    }
  }else{
    aa= a + v*t;
    bb= b + w*t;
    if(aa>=bb){
      printf("YES");
    }else{
      printf("NO");
    }
  }
}