链接:https://ac.nowcoder.com/acm/contest/327/C
砝码每次都选3的k次放。。
#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
using namespace std;
int main(){
long double n,sum = 1,cnt = 1;
cin>>n;
long long ans = 1;
while(sum<n){
cnt *= 3;
sum += cnt;
++ans;
}
cout<<ans<<endl;
return 0;
}