const input = require("fs").readFileSync("/dev/stdin", "utf8")
let cin = input.split(/ |\n/), cid = 0
const next = () => cin[cid++]
const nexts = (n) => cin.slice(cid, cid+=n).map(i=>parseInt(i))

const [A, V, B, W, T] = nexts(5)

firstA = A
firstB = B
endA = A + T * V
endB = B + T * W

firstA < firstB && endA >= endB ? console.log('YES') : console.log('NO')
