2683: Problem I

#include<iostream>
using namespace std;
int main()
{
    int n;
    while(scanf("%d",&n)==1&&n)
    {
        int sum2=0,sum3=0;
        for(int i=2;i<=n;i++)
        {
            int t=i;
            if(t%2==0)
            {
                while(t%2==0)
                {
                    sum2++;
                    t/=2;
                }
            }
            if(t%3==0)
            {
                while(t%3==0)
                {
                    sum3++;
                    t/=3;
                }
            }
        }
        int num=0;
        while(1)
        {
            if(sum2<2) break;
            if(sum3<1) break;
            sum2-=2;
            sum3--;
            num++;
        }
        printf("%d/n",num);
    }
    return 0;
}