def exgcd(a, b):
    if b==0: return 1,0,a
    r = exgcd(b, a%b)
    return r[1],r[0]-a//b*r[1],r[2]

def crt(a0, m0, a1, m1):
    g = exgcd(m0,m1)[2]
    if a0%g!=a1%g: return -1,-1
    if g > 1:
        m0//=g
        m1//=g
        while True:
            h = exgcd(m0,g)[2]
            if h==1: break
            m0*=h
            g//=h
        m1 *= g
        a0 %= m0
        a1 %= m1
    r = exgcd(m0, m1)
    p,q,g=r[0],r[1],r[2]
    x = a0*q*m1+a1*p*m0
    m=m0*m1
    x%=m
    if x<0: x+=m
    return x,m

X=[]
Y=[]
for i in range(3):
    x, y = map(int, input().split())
    X.append(x)
    Y.append(y)

x, y = X[0], Y[0]
for i in range(1, 3):
    x, y = crt(x, y, X[i], Y[i])
    if x==-1:
        break
if x==0: print(y)
else: print(x)