#include<math.h>

using namespace std;

int main()

{

int N,n=1;

cin>>N;

for(;n*(n+1)<N*2;n++);

int sub=N-n*(n-1)/2;

if(n%2==0)

cout<<sub<<"/"<<n+1-sub;

else cout<<n+1-sub<<"/"<<sub;

return 0;

}