题解

#include<bits/stdc++.h>
using namespace std;

int main(){
	int n;
    cin >> n;
	int k = 1;
	while(n > k){
		n -= k;
		k++;
	}
	if(k % 2 == 0){
       cout << n << "/" << k - n + 1; 
    }else{
        cout << k - n + 1 << "/" << n;
    } 
	return 0;
}