#include<stdio.h>
int main()
{
    long long int a,b,c,d,e,f,g;
    scanf("%lld %lld",&a,&b);
    scanf("%lld %lld",&c,&d);
    scanf("%lld",&e);
    f=d-b;
    g=c-a;
    if(g<0) g=-g;
    if(f*e>=g)
        printf("YES\n");
    else printf("NO\n");
    return 0;
}
