function Main(input) {
  var lines = input.split('\n');
  var line_1 = lines[0].split(' ');
  var line_2 = lines[1].split(' ');
  var N = Number(line_1[0]);
  var M = Number(line_1[1]);
  var count = 0;
  var all = 0;
  for (var j = 0; j < N; j ++) {
    all += Number(line_2[j]);
  }
  for (var i = 0; i < N; i ++) {
    var A = Number(line_2[i]);
    if ((1/(4*M)*all) <= A ) {
      count ++;
    }
  }
  if (M <= count) {
    console.log('Yes');
  } else {
    console.log('No');
  }
}

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