Multiple of 3

You are given a program that outputs all the numbers from 0 to 20. Change the code to make it output only numbers that are multiples of 3.

#include <iostream>
using namespace std;

int main()
{
    //change the code
    int num = 0;

    while(num<=20){
    num+= 3;
    if(num<=20)
    cout<<num<<endl;
    }
    return 0;
}

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