#include <stdio.h>
int main(){
	int a,b,c;
	int gcd=0;
	scanf("%d %d %d",&a,&b,&c);
	int minn=a;
	if (b<minn){
		minn=b;
	}
	if (c<minn){
		minn=c;
	}
	int maxn=a;
	if (b>maxn){
		maxn=b;
	}
	if (c>maxn){
		maxn=c;
	}
	for (int i =minn-1;i>1;i--){
		if (minn%i==0&&maxn%i==0 ){
			gcd=i;break;
		}  
			
	}
	printf("%d/%d",minn/gcd,maxn/gcd);
	
	return 0;
}