#include<iostream>
using namespace std;
int max(int a,int b)
{
return a > b ? a:b;
}
int min(int a,int b)
{
return a < b ? a:b;
}
//辗转相除法求出最大公约数
int gcd(int a,int b)
{
while(b > 0)
{
int t = a % b;
a = b;
b = t;
}
return a;
}
int main()
{
int a,b,c;
int x,y;
cin>>a>>b>>c;
x = max(a,max(b,c));
y = min(a,min(b,c));
int z = gcd(x,y);//求出最大公约数
printf("%d/%d",y/z,x/z);
system("PAUSE");
return 0;
}