import sys

sys.setrecursionlimit(10 ** 8)

input = sys.stdin.readline


def main():
    A, B = [int(x) for x in input().split()]

    keisu = 0.0001
    ans = 0
    for x in range(A * (10 ** 4), B * (10 ** 4)):
        ans += 0.0001 * abs((x * keisu - A) * (x * keisu - B))

    print(ans)


if __name__ == '__main__':
    main()