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    1. public boolean isUgly(int num) {
    2.         if(num==0)
    3.             return false;
    4.         while(num%2==0)
    5.             num/=2;
    6.         while(num%3==0)
    7.             num/=3;
    8.         while(num%5==0)
    9.             num/=5;
    10.         return num==1;
    11.     }