def gcd(a,b):
    if b==0:
        return a
    
    return gcd(b,a%b)
    
def lcm(a,b):
    return a//gcd(a,b)*b
    

T1=int(input())
T2=int(input())
T3=int(input())

A1=T1*T2
A2=T2*T3
A3=T1*T3
B1=T2-T1
B2=T3-T2
B3=T3-T1

L=lcm(lcm(B1,B2),B3)
A1=A1*L//B1
A2=A2*L//B2
A3=A3*L//B3
LL=lcm(lcm(A1,A2),A3)
G=gcd(LL,L)
LL=LL//G
L=L//G
print(str(LL)+"/"+str(L))