#include<stdio.h>
signed main(){
    int A, B, V, W, T;
    scanf("%d%d%d%d%d",&A, &V, &B, &W, &T);
    int sum1, sum2;
    sum1 = A + (V * T);
    sum2 = B + (W * T);
    if(sum1 >= sum2){
        printf("YES\n");
    }else if (sum2 > sum1){
        printf("NO\n");
    }
    
    return 0;
}