#include <stdio.h>

int main(void)

{

    int i = ;int j = ;int count = ;int k = ;

    int left;int right;

    int flag = ;

    scanf("%d",&count);

    while()

    {

        k++;

        if((k%) == )

        {

            for(right = k,left = ; right >= ; right--,left++)

            {

                i++;

                printf("count:%d:%d/%d\n",i,left,right);

                if(i == count)

                {

                    flag = ;

                    break;

                }

            }

        }else{

            for(left = k,right = ; left >= ; left--,right++)

            {

                i++;

                printf("count:%d:%d/%d\n",i,left,right);

                if(i == count)

                {

                    flag = ;

                    break;

                }

            }

        }

        if(flag > )

            break;

    }

    printf("%d/%d\n",left,right);

    return ;

}