l = list(map(int, input().split(" "))) r1 = [l[0], l[1]] r2 = [l[2], l[3]] r3 = [l[4], l[5]] def qujian(x, y): if x[1] < y[1] and x[1] >= y[0]: return(2*x[1]) if y[1] < x[1] and y[1] >= x[0]: return(2*y[1]) else: return(-1) ans1 = qujian(r1, r2) ans...