#include <math.h>
#include <stack>
#include <stdio.h>
#include <iostream>
#include <vector>
#include <iomanip>
#include <string.h>
#include <algorithm>
using namespace std;
#define LL long long
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int main()
{
    int n , sum = 0 ,k = 0;
    cin >> n;
    sum = n;
    while(n >= 3)
    {
        sum +=n/3;
        n = n/3 +n%3;
    }
    cout<<sum<<endl;
}

#include <bits/stdc++.h>
using namespace std;
int a,k,ans;
int main()
{
	cin>>a;
	ans = a;
	k = a;
	while(k>=3){
	ans+=k/3;
	k = k%3+k/3;
	}
	cout<<ans;
	return 0;
}

/crl(陈儒乐)/

#include<bits/stdc++.h>//网上查到的万能头//

using namespace std;

int main()

{

int n;

cin >> n;

int ans = n;

int k = n;

while(k >= 3)

{

    ans += k/3;

    k = k%3 + k/3;

}

cout << ans << endl;

return 0;

}

#include <iostraem>
using namespace std;
int main()
{
	int a, z;
	cin>>a>>z;
	if (a>= 10 && z >= 20 )
```
```
{
	cout<<1;
}
else
{
	cout<<0;
}
return 0;
```

}

```
我就看谁傻傻地直接超题解
```

```

```

#include <iostream>
#include <math.h>
using namespace std;
int main()
{
	int n,sum=0,k=0;
	cin>>n;
	sum=n;
	while(n>=3)
	{
		sum+=n/3;
		n=n/3+n%3;
	}
	cout<<sum<<endl;
}

#include<iostream>
#include<stdio.h>
#include <math.h>
using namespace std;
int main()
{
    int n , sum = 0 ,k = 0;
    cin >> n;
    sum = n;
    while(n >= 3)
    {
        sum +=n/3;
        n = n/3 +n%3;
    }
    cout<<sum<<endl;
}

#include <iostream>
#include <math.h>
using namespace std;
int main()
{
    int n,sum = 0,k = 0;
    cin >> n;
    sum = n;
    while(n >= 3)
    {
        sum += n/3;
        n=n/3+n%3;
    }
    cout<<sum<<endl;
}

#include using namespace std; const int N=1e2+10; const int INF=0x3f3f3f3f; int a,b,n; int main(){ cin>>n; b=n; while(n>=3) { a=n/3; n=n%3+a; b+=a; } cout<<b; return 0; }

#include <iostream>
#include <math.h>
using namespace std;
int main()
{
	int n,sum=0,k=0;
	cin>>n;
	sum=n;
	while(n>=3)
	{
		sum+=n/3;
		n=n/3+n%3;
	}
	cout<<sum<<endl;
}