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https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2091
#include <iostream>
using namespace std;
int main()
{
int n, cola, sum;
while(cin>>n)
{
if(1<=n && n<=200)
{
cola=n;
while(n>=3)
{
sum=n/3;
cola+=sum;
n=n%3+sum;
}
if(n==2)
cola++;
cout<<cola<<endl;
}
}
}
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