#include<cstdio>
using namespace std;
int main()
{
    long i,n,m;
    scanf("%d",&n);
    for (i=1;i<=3000;i++)
        {
            if (n>i*(i-1)/2&&n<=i*(i+1)/2)
                break;
        }
    if (i%2==0)
        m=n-i*(i-1)/2;  
    if (i%2==1)
        m=i+1-(n-i*(i-1)/2);
    printf("%d/%d",m,i+1-m);
    return 0;
}```