View Code of Problem 80

#include<bits/stdc++.h>
using namespace std;
int main() {
	int n;
	while (cin >> n) {
		if (n == 0)
			break;
		int t = 0;
		for (int i = 1; i <= n; i++) {
			t = (t + 3) % i;
		}
		cout << t + 1 << endl;
	} 
	return 0;
}