#include<stdio.h>
int main()
{
  int a,b,c,t;
  scanf("%d %d %d",&a,&b,&c);
  if(a<b){
    t=a;
    a=b;
    b=t;
  }
  if(a<c){
    t=a;
    a=c;
    c=t;
  }
  if(b<c){
    t=b;
    b=c;
    c=t;
  }
  int i;
  while(c!=0){
    i=a%c;
    a=c;
    c=i;
  }
  printf("%d/%d",c/i,a/i);
  return 0;
}

https://www.luogu.com.cn/record/90278925