from decimal import *

A, B = map(int, input().split())
ans = 10**18
for a in range(1005):
    for b in range(1005):
        if a + b == 0:
            continue
        x = Decimal(100 * a)/(a + b)
        x = x.quantize(Decimal('0'), rounding=ROUND_HALF_UP)
        y = Decimal(100 * b)/(a + b)
        y = y.quantize(Decimal('0'), rounding=ROUND_HALF_UP)
        if x == A and y == B:
            ans = min(ans, a + b)
print(ans)