"use strict"
function main(arg) {
    var m = arg.trim().split("\n")[0].split(' ').map(Number)[1]
    var ai = arg.trim().split("\n")[1].split(' ').map(Number).sort((a,b) => b - a)
    var sum = 0
    var sum_m = 0
    for (var i = m - 1; i < ai.length; i++) {
        sum_m += ai[i]
    }
    for (var i = 0; i < ai.length; i++) {
        sum += ai[i]
    }
    // console.log(sum)
    if (sum_m * (4 * m) < sum ) {
        console.log('No')
    } else {
        console.log('Yes')
    }
    
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));