#include<iostream>
using namespace std;
int yf(int a,int b){
	int f=0;
	for(int i=a;i>=1;i--){
		if(a%i==0&&b%i==0){
			f=i;
		}
	}
	return f;
}
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	int max=a>b?(a>c?a:c):(b>c?b:c);
	int min=a<b?(a<c?a:c):(b<c?b:c);
	int d=yf(min,max);
	cout<<min/d<<"/"<<max/d;
	return 0;
}