#!/usr/bin/python2
# -*- coding: utf-8 -*-
# †
A, B = map(int, raw_input().split())
assert A + B in [100, 101]

mini = float('inf')
for a in xrange(201):
    for b in xrange(201):
        deno = a + b
        if deno == 0:
            continue
        p = (100 * a + deno / 2) / deno # \frac{100a}{deno} の小数点以下四捨五入
        q = (100 * b + deno / 2) / deno
        if (p, q) == (A, B):
            mini = min(mini, deno)
print mini