#include <stdio.h>
#include <stdlib.h>

int main(void){
    unsigned long a,b,v,w,t;
    int i;
    
    scanf("%lu%lu%",&a,&v);
    scanf("%lu%lu",&b,&w);
    scanf("%lu%",&t);
    
    if(abs(v) >1000 && abs(w) > 1000 && t < 1000){
    	v = v%1000;
    	w = w%1000;
    	t = t%1000;
    }
    
    //printf("%lu%lu%lu%lu%lu",a,v,b,w,t);
    
    if(a > b){
    	if(a-(v*t) > b-(w*t)){
    		printf("NO");
    	}
    	else{
    		printf("YES");
    	}
    }
    else{
    	 if(a+(v*t) < b+(w*t)){
    		printf("NO");
    	}
    	else{
    		printf("YES");
    	}
    }
    
    printf("\n");
    
}