mod = 1000000007
eps = 10**-9


def main():
    import sys
    import math
    input = sys.stdin.readline

    a, b, c, d, e, f = map(int, input().split())
    print(math.sqrt((f-e)/a + (c*c + d*d)/(4*a*a)))


if __name__ == '__main__':
    main()