#include <stdio.h>
#include <math.h>

int main(void){
    long long int a,b;
    unsigned long int v,w;
    unsigned long int t;
    scanf("%lo %lu",&a,&v);
    scanf("%lo %lu",&b,&w);
    scanf("%lu",&t);

    if(v == w && a != b){
        printf("NO");
        return 0;
    }

    ((abs(a)-abs(b))/(abs(v)-abs(w))) > t?printf("YES"):printf("NO");


    return 0;
}