//
public boolean isUgly(int num) {
    if (num == 0) return false;
    while (num % 2 == 0) num /= 2;
    while (num % 3 == 0) num /= 3;
    while (num % 5 == 0) num /= 5;
    return num == 1;
}
//
public boolean isUgly(int num) {
    if(num <= 0) return false;
    int[] factor = {2, 3 ,5};
    int i = 0;
    while(num != 1){
        int remainder = num % factor[i];
        if(remainder == 0) num = num / factor[i];
        else if(i < factor.length-1) i++;
        else if(i == factor.length-1) break;
    }
    return num == 1;
}