View Code of Problem 80

#include <stdio.h>
int main()
{
	int n,i;
	while(scanf("%d",&n)!=EOF)
	{
		int s=0;
		if(n==0) break;
		for(i=2;i<=n;i++)
		{
			s=(s+3)%i;
		}
		printf("%d\n",s+1);
    }
    return 0;
}