View Code of Problem 80

#include <iostream>

using namespace std;

int main()
{
  int n;
	while(cin>>n)
	{
		if(n==0)
		break;
		int k=0;
		for(int i=2;i<=n;i++)
		k=(k+3)%i;
		cout<<k+1<<endl;
	}



   return 0;
}