# product 
# Fig. 18.2 
# inputs: 7 13

def prod(x,y):
  if y == 1:
    return x
  elif (y%2 == 1):
    return x + prod(x, y-1)
  else:
    return prod(x+x, y//2)

x,y = map(int, input("x y=? ").split())
print(prod(x,y))