#include <stdio.h>
int main()
{
	int n,x=1,i=1;
	scanf("%d",&n);
	while(n>x)
	{
		i++;
		x=(i+1)*i/2;
	}
	if(n==x)
	printf("%d/1",i);
	else
	printf("%d/%d",n+i-x,x-n+1);
	return 0;
}