#include<stdio.h>

int main(){
 int V,W;
 int A,B;
  scanf("%d %d",&A,&V);
  scanf("%d %d",&B,&W);
  scanf("%d",&T);
  if(A==B)printf("YES\n");
  else if(A<B){
    if(A+T*V>=B+T*W)printf("YES\n");
    else printf("NO\n");
  }
  else{
    if(A-T*V<=B-T*W)printf("YES\n");
    else printf("NO\n");
  }  
  return 0;
}
