#include <stdio.h>

int main()
{
    int a, b, v, w, t;
    long a_, b_;

    scanf("%d %d", &a, &v);
    scanf("%d %d", &b, &w);
    scanf("%d", &t);

    if (a < b)
    {
        a_ = (long)a + (long)v * (long)t;
        b_ = (long)b + (long)w * (long)t;

        if (a_ >= b_)
        {
            printf("YES");
            return 0;
        }
    }
    else
    {
        a_ = a - v * t;
        b_ = b - w * t;
        if (a_ <= b_)
        {
            printf("YES");
            return 0;
        }
    }

    printf("NO");
    return 0;
}
