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)

isSamePos = false
for (let i = 0; i < T; i++) {
    if (A + V * i == B + W * i) {
        isSamePos = true
    }
}
if (!isSamePos) return console.log('NO')

if (A + V * T >= B + W * T) {
    console.log('YES')
} else {
    console.log('NO')
}
