View Code of Problem 80

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