#include<stdio.h>
 
int main(){
 
long A,B,V,W,T;
long SA,SB,BA,BB;
while(scanf("%ld %ld",&A,&V)==0);
while(scanf("%ld %ld",&B,&W)==0);
while(scanf("%ld",&T)==0);
 
if(A>B){
BA=A+V*T;
BB=B+W*T;
 
if(BB>=BA){
printf("YES");
}else{
printf("NO");
}
 
}else{
SA=A-V*T;
SB=B-W*T;
 
if(SA>=SB){
printf("YES");
}else{
printf("NO");
}
 
}
 
 
 
return 0;
}