Level.1 연습문제 > 콜라츠 추측

def solution(num):
    
    proc = 0;
    
    while proc < 500:
        if num == 1:
            return proc;
        if num % 2 == 0:
            num = num // 2;
        else:
            num = num * 3 + 1;
        proc +=1;
    
    return -1;