#include <iostream>
using namespace std;
int main() {
	int n = 0, sum = 0;
	int i, j;
	cin >> n;
	for(i = 1 ;  n >= sum; i++) {
		sum += i;
	}
	sum -= i;
	j = n - sum;
	cout << j-1 << '/' << i - j + 1;
	return 0;
}