"use strict";

function main(arg) {
    const input = arg.split("\n")
    const [A, V] = input[0].split(" ").map(x=>Number(x))
    const [B, W] = input[1].split(" ").map(x=>Number(x))
    const T = Number(input[2])

    let nowA = A
    let nowB = B
    let isCaught = 'NO'
    if(V < W) {
        // can't catch
    } else {
        for(let i=1; i<=T; i++) {
            
            let nextB0 = nowB + W
            let nextB1 = nowB - W
            if(nextB0===nowA || nextB1===nowA) {
                if(V===2 * W) {
                    isCaught = 'YES'
                    break
                }
            }
            
            if(nowA < nowB) {
                nowA = nowA + V
            } else if(nowA > nowB) {
                nowA = nowA - V
                
            }
            let dif0 = Math.abs(nowA - nextB0)// distance to A if B goes to plus dir
            let dif1 = Math.abs(nowA - nextB1)// distance to A if B goes to minus dir
            //console.log(`dif0=${dif0}, dif1=${dif1}`)
            if(dif0 > dif1) {
                nowB = nowB + W
            } else {
                nowB = nowB - W
            }
            //console.log(`nowA=${nowA}, nowB=${nowB}`)
            
            if(nowA == nowB){
                isCaught = 'YES'
                break;
            }
        }
    }
    console.log(isCaught)
    
}

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