Number of zeroes in end of factorial.

task1.js

var getZeroesOfFactorial = function (n) {
    var number_of_2 = 0;
    var number_of_5 = 0;
    var number_of_zeroes_of_factorial = 0;

    for (var i = 2; i <= n; i++) {
        var currentValue = i;
        console.log(i);
        while (currentValue >= 5) {
            if (currentValue % 5 == 0) {
                console.log(currentValue);
                currentValue = currentValue / 5;
                number_of_5++;
            } else {
                break;
            }
        }
        currentValue = i;
        while (currentValue >= 2) {
            if (currentValue % 2 == 0) {
                console.log(currentValue);
                currentValue = currentValue / 2;
                number_of_2++;
            } else {
                break;
            }
        }
    }

    if (number_of_5 <= number_of_2) {
        number_of_zeroes_of_factorial = number_of_5;
    } else {
        number_of_zeroes_of_factorial = number_of_2;
    }
    console.log("number_of_2 = " + String(number_of_2));
    console.log("number_of_5 = " + String(number_of_5));
    return number_of_zeroes_of_factorial;
};

var userNumber = prompt("введите число");

var factorial_zeroes = getZeroesOfFactorial(userNumber);
console.log("zeroes = " + String(factorial_zeroes));
alert(factorial_zeroes)