View Code of Problem 80

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