
function main(input) {
    let [av,bw,t] = input.trim().split('\n')
    let [a,v] = av.split(' ').map(n => Number(n))
    let [b,w] = bw.split(' ').map(n => Number(n))

    const dist = Math.abs(a - b)
    const speed = v - w
    const is_catchable = (speed > 0) && (dist / speed <= Number(t))

    console.log(is_catchable ? 'YES' : 'NO')
}

main(require("fs").readFileSync("/dev/stdin", "utf8"))
