import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

from math import gcd

# 相対速度を持つ

a,b,c = sorted(map(int,read().split()))

x = a * c * (b - a); y = a * b * (c - a)
n = x * y // gcd(x,y); d = (b-a) * (c-a)
g = gcd(n,d); n //= g; d //= g
print('{}/{}'.format(n,d))