#include<bits/stdc++.h>
using namespace std;
long long absmy(long long x)
{
    if(x<0) return -x;
    else return x;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    long long a,va,b,vb,t,flag;
    cin>>a>>va;
    cin>>b>>vb;
    cin>>t;
    if(a==b) {cout<<"YES\n";return 0;}
    if(va<=vb) {cout<<"NO\n";return 0;}

    if( absmy(a-b)<= (va-vb)*t ) flag=1;
    else flag=0;
    if(flag==1) cout<<"YES\n";
    if(flag==0) cout<<"NO\n";
    return 0;
}
/**************************************************************
    Problem: 4571
    User: contest21_42
    Language: C++
    Result: 正确
    Time:3 ms
    Memory:2180 kb
****************************************************************/