View Code of Problem 80

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