"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'
    for(let i=1; i<=T; i++) {
        
        let nextB0 = nowB + W
        let nextB1 = nowB - W
        if(nextB0===nowA || nextB1===nowB) {
            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"));