a=[1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23] b=[[0]*4 for x in range(3)] for i in range(len(a)): x=i//4 y=i%4 b[x][y]=a[i] x,y=input().split() x,y=int(x),int(y) print(b[x][y])