people=2
m=0
stop=0
min_=int(float(input())*100)
max_=int(float(input())*100)
while stop!=1:
    for i in range (min_+1,max_):
        j=list(str(float((people*i)/10000)))
        while j[m]!='.':
            m+=1
        if int(j[0])>0:
            try:
                if j[m+1]=='0'and j[m+2]=='0':
                    print (people)
                    stop=1
                    break
            except IndexError:
                if j[m+1]=='0':
                    print (people)
                    stop=1
                    break
    people+=1