View Code of Problem 80

#include <iostream>
using namespace std;
int main()
{
    int n; 
    while (cin>>n)
    {
        if(n==0)	break;
    	int s=0;
    	for(int i=2;i<=n;i++)
    		s=(s+3)%i;
    	cout<<s+1<<endl;
    }
    return 0;
}