View Code of Problem 80

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