import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

def round_int(number, number2):
    number *= 10
    number = number // number2 // 10 * 10 + number // number2 % 10 // 5 * 10
    number //= 10
    return number

a, b = MI()
ans = 200

for i in range(101):
    for j in range(101):
        if i + j == 0:
            continue
        if round_int(100*i , (i+j)) == a and round_int(100*j , (i+j)) == b:
            ans = min(ans, i + j)

print(ans)