#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
while(cin >> n && n > 0)
{
int d = 0, c = 0;
while(n > 1)
{
d = n%3;
c += n/3;
n = d + (n/3);
if(n == 2)
{
c++;
break;
}
}
cout << c << endl;
}
return 0;
}
using namespace std;
int main()
{
int n;
while(cin >> n && n > 0)
{
int d = 0, c = 0;
while(n > 1)
{
d = n%3;
c += n/3;
n = d + (n/3);
if(n == 2)
{
c++;
break;
}
}
cout << c << endl;
}
return 0;
}
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