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class Solution {
public:
    bool isUgly(int num) {
        if (num < 0) return false;
        if (num == 1) return true;
        while (num>=2 && num%2 == 0) num /= 2;
        while (num>=3 && num%3 == 0) num /= 3;
        while (num>=5 && num%5 == 0) num /= 5;
        return num == 1;
    }
};