20250820

# n,k=map(int, input().split())
# arr=list(map(int, input().split()))
# sum=-10000000
# pl=0
# for j in range(k):
#     pl=pl+arr[j]
#     sum=pl
# for i in range(n-k):
#     pl=pl-arr[i]+arr[i+k]
#     if pl>sum:
#         sum=pl
# print(sum)

'''
ord(문자) -> 아스키코드

chr(아스키코드) -> 문자
'''
#
# a = input()
# for i in range(len(a)) :
#     print(ord(a[i]))
#     # if a[i]=='t' :
#     #     print(i+1, end=' ')
#     # print(a[i])


a,b=map(int, input().split('x'))
x=(b/a)*-1
print(format(x,".2F"))