View Code of Problem 80

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