def x_to_cnt(x):
    cnt2,cnt5=0,0
    while x%2==0:
        x//=2
        cnt2+=1
    while x%5==0:
        x//=5
        cnt5+=1
    return cnt2,cnt5
def cnt_to_x(cnt2,cnt5):
    return 2**cnt2*5**cnt5
x1,x2=map(int,input().split())
c12,c15=x_to_cnt(x1)
c22,c25=x_to_cnt(x2)
while (c12,c15)!=(7,9):
    if c12<7:
        x1*=2
        c12+=1
    elif c12>7:
        x1//=2
        c12-=1
    elif c15<9:
        x1*=5
        c15+=1
    elif c15>9:
        x1//=5
        c15-=1
    print(x1)
    if x1==x2:
        exit()
    x2=int(input())
    if x1==x2:
        exit()
assert x1==2**7*5**9
if (abs(c12-c22)+abs(c15-c25))%2==0:
    x1=10**9
    print(x1)
    if x1==x2:
        exit()
    x2=int(input())
    if x1==x2:
        exit()
else:
    x1*=2
    print(x1)
    if x1==x2:
        exit()
    x2=int(input())
    if x1==x2:
        exit()
    x1*=2
    print(x1)
    if x1==x2:
        exit()
    x2=int(input())
    if x1==x2:
        exit()

while True:
    assert 10**9%x1==0
    assert 10**9%x2==0
    if x1==x2:
        exit()
    c12,c15=x_to_cnt(x1)
    c22,c25=x_to_cnt(x2)
    if abs(c12-c22)>=abs(c15-c25):
        if c12<c22:
            x1*=2
            c12+=1
        elif c12>c22:
            x1//=2
            c12-=1
        else:
            assert False
    else:
        if c15<c25:
            x1*=5
            c15+=1
        elif c15>c25:
            x1//=5
            c15-=1
        else:
            assert False
    print(x1)
    if x1==x2:
        exit()
    x2=int(input())