def solve(a, b, c):

    if a + b <= c:
        return("1/1")
    else:
        big_triangle = c ** 2
        
        if c > a:
            big_triangle -= (c-a) * (c-a)
        if c > b:
            big_triangle -= (c-b) * (c-b)
            
        result = F.Fraction(big_triangle, 2 * a * b)

        return str(result)