#include <iostream.h>
int main()
{
    long n=1;
    int sum=0;
    while(sum<1500)
    {
        long m=n;
        while(m%2==0)
        {
            m/=2;
        }
        while(m%3==0)
        {
            m/=3;
        }
        while(m%5==0)
        {
            m/=5;
        }
        if(m==1) sum++;
        n++;
    }
    cout<<n-1<<endl;
    //getch();
    cin>>n;
}     

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