View Code of Problem 80

#include<bits/stdc++.h>
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;
}