from fractions import Fraction

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

T4 = 1 / (Fraction(1, T1) + Fraction(1, T2))
T5 = 1 / (Fraction(1, T1) + Fraction(1, T3))
T6 = 1 / (Fraction(1, T1) - Fraction(1, T2))
T7 = 1 / (Fraction(1, T1) - Fraction(1, T3))
time = []

for i in range(1, 10000):
    time.append(T4 * i)
    time.append(T6 * i)

time.sort()


for t in time:
    tn = t.numerator
    td = t.denominator
    if (tn * T5.denominator) % (td * T5.numerator) == 0:
        print(t)
        break;
    if (tn * T7.denominator) % (td * T7.numerator) == 0:
        print(t)
        break;