#include<stdio.h>
int main()
{
float i,n,count=0,x,j;
float a;
scanf("%f",&x);
for(i=1;;i++)
{
for(j=1,n=0;j+n<=i;n++)
{
if((int)i%2==0)
{
a=((j+n)/(i-n));
count++;
}
else if((int)i%2!=0)
{
a=((i-n)/(j+n));
count++;
}
if(count==x) break;
}
if(count==x) break;
}
if((int)i%2==0)
printf("%d/%d",(int)(j+n),(int)(i-n));
else
printf("%d/%d",(int)(i-n),(int)(j+n));
return 0;
}
