#!/usr/bin/env python3
import sys
from bisect import bisect, bisect_left, bisect_right, insort, insort_left, insort_right  # type: ignore
from collections import Counter, defaultdict, deque  # type: ignore
from fractions import gcd  # type: ignore
from heapq import heapify, heappop, heappush, heappushpop, heapreplace, merge  # type: ignore
from itertools import accumulate, combinations, permutations, product  # type: ignore


LI = lambda: list(map(int, sys.stdin.buffer.readline().split()))
I = lambda: int(sys.stdin.buffer.readline())
LS = lambda: sys.stdin.buffer.readline().rstrip().decode("utf-8").split()
S = lambda: sys.stdin.buffer.readline().rstrip().decode("utf-8")
IR = lambda n: [I() for _ in range(n)]
LIR = lambda n: [LI() for _ in range(n)]
SR = lambda n: [S() for _ in range(n)]
LSR = lambda n: [LS() for _ in range(n)]
SRL = lambda n: [list(S()) for _ in range(n)]
MSRL = lambda n: [[int(i) for i in list(S())] for _ in range(n)]

a, b = LI()
print((1 - b / a) * 100)
