#include<stdio.h>
int main ()
{
    int n, s, c;
    while(scanf("%d",&n) != EOF){
        c=n,s=0;
        for(;;){
            if(n<3) break;
            s+=n%3;
            n=n/3;
            c+=n;
        }
        printf("%d\n",s+c);
    }
    return 0;
}