View Code of Problem 80

#include <stdio.h>
#include <stdlib.h>
#include<ctype.h>
#include<string.h>
#include<math.h>

int main()
{
	int sum, n, i,k;

	while (scanf("%d", &sum) != EOF)
	{
		if (sum == 0)
			break;
		
		n = 0;

		for (i = 2; i <= sum; i++)
		{
			n = (n + 3) % i;
		}printf("%d\n", n + 1);
	}
	
	return 0;
}