JSFiddle - React, Tailwind, and code Playground

JavaScript

// var numbers = +prompt("Введите количество цифр")
	var numbers = 10
	var pages = 1
	if (numbers <= 4) 

	{
		console.log("Введите большее число")
	}
	if (numbers > 4)
	{
		for (var i = 4; numbers = 0; i++)
		{
			if (i < 10)
				{
					pages = pages + 1
					numbers = numbers - 1
					continue;
				}
			if (i < 100)
				{
					pages = pages + 2
					numbers = numbers - 2
					continue;
				}
			if (i < 1000)
				{
					pages = pages + 3
					numbers = numbers - 3
					continue;
				}
			if (i < 10000)
				{
					pages = pages + 4
					numbers = numbers - 4	
					continue;
				}
					
		}
	}
console.log (pages);