n,k = map(int,input().split())
a=[]
b=[]
c=[]
for i in range(1,n+1):
if i%5==0:
a.append(i)
elif(i%3==0 and i%5!=0):
b.append(i)
else:
c.append(i)
d = b[::-1]
t = a+b+c
print(t[k-1])