import Foundation

func readInts() -> [Int] {
    readLine()!.split(separator: " ").map { Int($0)! }
}

func main(){
    let av = readInts()
    let bw = readInts()
    let t = Int(readLine()!)!
    
    if abs(av[0] - bw[0]) <= t * (av[1] - bw[1]) {
        print("YES")
        return
    }
    print("NO")
        
}
main()
