Less Naive implementation of uniform distribution

LessNaive.js

/**
 * Given a function which produces a random integer in the range 1 to 5, write
 * a function which produces a random integer in the range 1 to 7.
 */

//returns a random number between 1-5 (inclusive)
var random1to5 = function() {
  return Math.ceil(Math.random() * 5);
};

//find a number between 1-7 without Math.random
var random1to7 = function () {
	var x = 22;
	while (x > 21)
		x = random1to5() + random1to5()*5 - 5;
	var randomNum = 1 + (x % 7);
	return randomNum
};