rt

#include<iostream>
using namespace std;

int main() {
	int n, a, b, i = 1, sum = 0;
	cin >> n;
	while (sum < n) {
		sum += i;
		i++;
	}
	sum = sum - i + 1;
	i--;
	a = n - sum;
	b = i - a + 1;
	cout << a << "/" << b << endl;
	return 0;
}