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