from functools import reduce

def str2float(s):

    s = s.split('.')

    a = s[0]

    b = s[1]

    if a[0] == '-':

        a = a[1:]

        front = reduce(lambda x,y:y+x*10,map(int,a))

        a = 0

        if 'e' in b:

            print('a')

            for i in b:

                a += 1

                if i == 'e':

                    c = b[a+1:]

                    middle = reduce(lambda x,y:y+x*10,map(int,c))

                    b = b[:a-1]

                    buttom = reduce(lambda x,y:y+x*10,map(int,b))

                    result = (front + buttom / 10 ** (len(b))) / 10 ** middle

                    result = -result

                    print(result)

                    return result

        else:

            print('b')

            buttom = reduce(lambda x, y: y + x * 10, map(int, b))

            result = front + buttom / 10 ** (len(b))

            result = -result

            print(result)

            return result

    else :

        front = reduce(lambda x, y: y + x * 10, map(int, a))

        a = 0

        if 'e' in b:

            print('c')

            for i in b:

                a += 1

                if i == 'e':

                    c = b[a+1:]

                    middle = reduce(lambda x,y:y+x*10,map(int,c))

                    b = b[:a-1]

                    buttom = reduce(lambda x,y:y+x*10,map(int,b))

                    result = (front + buttom / 10 ** (len(b))) / 10 ** middle

                    print(result)

                    return result

        else:

            print('d')

            buttom = reduce(lambda x, y: y + x * 10, map(int, b))

            result = front + buttom / 10 ** (len(b))

            print(result)

            return result