#include<bits/stdc++.h>
using namespace std;

#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)

#define ll long long

void reader(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(ll *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}

void writer(ll x, char c){int s=0,m=0;char f[20];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
template<class T> void writerLn(T x){writer(x,'\n');}

template<class T> void sort(int N, T a[], void *mem = NULL){sort(a,a+N);}
template<class T1, class T2> void sort(int N, T1 a[], T2 b[], void *mem){int i;pair<T1,T2> *r=(pair<T1, T2>*)mem;rep(i,N)r[i].first=a[i],r[i].second=b[i];sort(r,r+N);rep(i,N)a[i]=r[i].first,b[i]=r[i].second;}
template<class T1, class T2, class T3> void sort(int N, T1 a[], T2 b[], T3 c[], void *mem){int i;pair<T1,pair<T2,T3> > *r=(pair<T1,pair<T2,T3> >*)mem;rep(i,N)r[i].first=a[i],r[i].second.first=b[i],r[i].second.second=c[i];sort(r,r+N);rep(i,N)a[i]=r[i].first,b[i]=r[i].second.first,c[i]=r[i].second.second;}
template<class T1, class T2, class T3, class T4> void sort(int N, T1 a[], T2 b[], T3 c[], T4 d[], void *mem){int i;pair<pair<T1,T2>,pair<T3,T4> > *r=(pair<pair<T1,T2>,pair<T3,T4> >*)mem;rep(i,N)r[i].first.first=a[i],r[i].first.second=b[i],r[i].second.first=c[i],r[i].second.second=d[i];sort(r,r+N);rep(i,N)a[i]=r[i].first.first,b[i]=r[i].first.second,c[i]=r[i].second.first,d[i]=r[i].second.second;}

template<class T> void unique(T arr[], int &sz, int sorted=0){int i,k=0;if(!sorted)sort(arr,arr+sz);rep(i,sz)if(!k||arr[k-1]!=arr[i])arr[k++]=arr[i];sz=k;}

template<class T> T GCD(T a,T b){T r; while(a)r=b,b=a,a=r%a; return b;}
template<class T> T LCM(T a,T b){return a/GCD(a,b)*b;}
template<class T> T GCD(T a,T b,T c){return GCD(GCD(a,b),c);}
template<class T> T LCM(T a,T b,T c){return LCM(LCM(a,b),c);}
template<class T> void reduceFraction(T&a, T&b){T g=GCD(a,b);a/=g;b/=g;}

int N = 3;
ll T[3];

ll ko[100000]; int kos;

int main(){
  ll i, j, k, a, b;
  ll lcm, g, p[3], t[3];

  rep(i,N) reader(T+i);

  lcm = LCM(T[0], T[1], T[2]);

  rep(i,3) p[i] = lcm/T[i];

  rep(a,3) REP(b,a+1,3){
    g = max(p[a]-p[b], p[b]-p[a]);
    for(i=1;i*i<=g;i++) if(g%i==0){
      ko[kos++] = i;
      ko[kos++] = g/i;
    }
  }
  unique(ko, kos);
  
  g = 1;
  rep(a,kos){
    i = ko[a];
    rep(j,3){
      t[j] = p[j] % i;
      t[j] = min(t[j], i-t[j]);
    }
    if(t[0]==t[1] && t[0]==t[2]) g = max(g,i);
  }

  reduceFraction(lcm, g);
  writer(lcm,'/');
  writerLn(g);
  
  return 0;
}