#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
P, Q = map(float, read().split())

# %%
oo = P * Q
ox = P * (100 - Q)
xo = (100 - P) * (100 - Q)
xx = (100 - P) * Q

# %%
answer = oo / (oo + xo) * 100
print(answer)