guessing game not running

/*
Random number guessing game.
The user can select a number and the game
Will generate a random number from 1 to the number selected.
The user has a different number of chances to guess the number 
depending on how large a number selected
*/

// Prompt user to pick how high the random number will go and generate the random number
var input = prompt("Pick a number");
var randomNumber = Math.floor(Math.random()* input) + 1;
var guesses = 0;

// dermine the number of guesses allowed by how large a number the user picks.
function numberOfGuesses (input) {
    if input <= 10{
        guesses = 3 ;   
    } else if (input <= 100){
        guesses = 8;
    } else if (input <= 1000){
        guesses = 15;
    }else {
        guesses = math.float(Number*.3);
    }
}

// compare the guess to the random number generated.
function main (guesses) {
    for( i = guesses, i >0, i--)
        var guess = prompt('I am thinking of a number between 1 and ' + input + '. What is it? You can guess ' + guesses + 'time(s)');
        if (parseInt(guess) === randomNumber) {
            document.write('<p>you guessed the number!</p>');
        } else if (guess < randomNumber) {
            document.write('Your guess was too low, try again!');
            guesses -= 1
        } else {
            document.write('Your guess was too high, try again!');
            guesses -= 1
        }
    }
}


numberOfGuesses(input);
main(guesses);