import Foundation

var line = readLine()!.components(separatedBy: " ").map { Decimal(string: $0)! }
let A = line[0]
let V = line[1]
line = readLine()!.components(separatedBy: " ").map { Decimal(string: $0)! }
let B = line[0]
let W = line[1]
let T = readLine()!.components(separatedBy: " ").map { Decimal(string: $0)! }.first!

if abs(B - A) <= (V - W) * T {
    print("YES")
} else {
    print("NO")
}
