func readIntPair() -> (Int, Int) {
    let line = readLine()!.split(separator: " ").map({Int($0)!})
    return (line[0], line[1])
}

let (A, V) = readIntPair()
let (B, W) = readIntPair()
let T = Int(readLine()!)!

let distance = max(A, B) - min(A, B)
let shrink = V - W

print((shrink <= 0 || distance / shrink > T) ? "NO" : "YES")
