View Code of Problem 80

#include<stdio.h>
#include<string.h>

int main(){
	int n,i,sum;
	while(scanf("%d",&n)!=EOF&&n!=0){
		sum=0;
		for(i=2;i<=n;i++){
			sum=(sum+3)%i;
		}
		printf("%d\n",sum+1);
	}
	return 0;
}