#!/usr/bin/env python3
def rounddiv(p,q):
    return p//q + (2*(p%q) >= q)
a, b = map(int,input().split())
z = float('inf')
for x in range(1000):
    for y in range(1000):
        if x == y == 0:
            continue
        if rounddiv(100*x,x+y) == a and rounddiv(100*y,x+y) == b:
            z = min(z, x+y)
print(z)