View Code of Problem 80

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include<math.h>
void main() {

	int n;
	while (scanf("%d", &n) != EOF)
	{
		if (n == 0)
			break;
		int a = 0;
		for (int i = 1; i <= n; i++)
		{
			a = (a + 3) % i;
		}
		printf("%d\n", a + 1);
	}
}