"use strict"
function main(arg) {
    let tmp = arg.trim().split("\n")
    let [A,V] = tmp[0].split(" ").map(Number)
    let [B,W] = tmp[1].split(" ").map(Number)
    let T = Number(tmp[2])
    let at = BigInt(A)
    let bw = BigInt(B)
    for (let i = 1; i <= T; i++) {
        at += BigInt(V)
        bw += BigInt(W)
        if (at === bw) {
            console.log('YES')
            return
        }
    }
    console.log('NO')
    // if (at >= bw) {
    //     console.log('YES')
    // } else {
    //     console.log('NO')
    // }
    // console.log([at,bw])
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));
