View Code of Problem 80

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

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