#include <iostream>
#include <string>
using namespace std;
int howMany(long long n){
    if(n == 1) return 0;
    int l = 1, c = 1;
    while(l*3 < n){
            l*= 3;
            c++;
    }
    return c;
}

int main(){
    long long n;
    cin >> n;
    cout << howMany(n);

}